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=Synthesis=
==Legality==
==Cocaine Synthesis==
{{Disclaimer}}


====From "Recreational Drugs" by Professor Buzz====
Several precursors listed in the recipes below are governed by international treaties, specifically the United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances (1988), which mandates control over substances frequently used in the illicit manufacture of narcotic drugs:
HTML by Rhodium
* Benzaldehyde
* Methylamine
* Potassium permanganate
 
==Cocaine Synthesis from "Recreational Drugs" by Professor Buzz==


Although this drug is categorized as a local anesthetic, I have chosen to put it in with the hallucinogens because of the psychotomimetic effects that it produces. Cocaine is not a phenylethylamine, but it produces central nervous system arousal or stimulant effects which closely resemble those of the amphetamines, the methylenedioxyamphetamines in particular. This is due to the inhibition by cocaine of re-uptake of the norepinepherine released by the adrenergic nerve terminals, leading to an enhanced adrenergic stimulation of norepinephrine receptors. The increased sense of well being and intense, but short lived, euphoric state produced by cocaine requires frequent administration.
Although this drug is categorized as a local anesthetic, I have chosen to put it in with the hallucinogens because of the psychotomimetic effects that it produces. Cocaine is not a phenylethylamine, but it produces central nervous system arousal or stimulant effects which closely resemble those of the amphetamines, the methylenedioxyamphetamines in particular. This is due to the inhibition by cocaine of re-uptake of the norepinepherine released by the adrenergic nerve terminals, leading to an enhanced adrenergic stimulation of norepinephrine receptors. The increased sense of well being and intense, but short lived, euphoric state produced by cocaine requires frequent administration.
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The basic formula for cocaine starts by purchasing or making tropinone, converting the tropinone into 2- carbomethoxytropinone (also known as methyl-tropan-3-one-2-carboxylate), reducing this to ecgonine, and changing that to cocaine. Sounds easy? It really is not very simple, but with Reagan's new drug policies, cracking down on all of the drug smuggling at the borders, this synthetic cocaine may be the source of the future. This synthesis is certainly worth performing with the high prices that cocaine is now commanding. As usual, I will start with the precursors and intermediates leading up to the product.
The basic formula for cocaine starts by purchasing or making tropinone, converting the tropinone into 2- carbomethoxytropinone (also known as methyl-tropan-3-one-2-carboxylate), reducing this to ecgonine, and changing that to cocaine. Sounds easy? It really is not very simple, but with Reagan's new drug policies, cracking down on all of the drug smuggling at the borders, this synthetic cocaine may be the source of the future. This synthesis is certainly worth performing with the high prices that cocaine is now commanding. As usual, I will start with the precursors and intermediates leading up to the product.


'''Succindialdehyde'''
===Succindialdehyde===


This can be purchased, too. 23.2 g of succinaldoxime powder in 410 ml of 1 N sulfuric acid and add dropwise with stirring at 0°C a solution of 27.6 g of sodium nitrite in 250 ml of water over 3 hours. After the addition, stir and let the mixture rise to room temp for about 2 hours, taking care not to let outside air into the reaction. Stir in 5 g of Ba carbonate and filter. Extract the filtrate with ether and dry, evaporate in vacuo to get the succindialdehyde. This was taken from ''JOC, 22, 1390 (1957)''. To make succinaldoxime, see ''JOC, 21, 644 (1956)''.
This can be purchased, too. 23.2 g of succinaldoxime powder in 410 ml of 1 N sulfuric acid and add dropwise with stirring at 0°C a solution of 27.6 g of sodium nitrite in 250 ml of water over 3 hours. After the addition, stir and let the mixture rise to room temp for about 2 hours, taking care not to let outside air into the reaction. Stir in 5 g of Ba carbonate and filter. Extract the filtrate with ether and dry, evaporate in vacuo to get the succindialdehyde. This was taken from ''JOC, 22, 1390 (1957)''. To make succinaldoxime, see ''JOC, 21, 644 (1956)''.


'''Complete Synthesis of Succindialdehyde'''
===Complete Synthesis of Succindialdehyde===


''JACS, 68, 1608 (1946)''
''JACS, 68, 1608 (1946)''
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Take the total amount of succinaldehyde (obtained from 4 of the above syntheses combined) and without further treatment or purification (this had better be 15.5 g of succindialdehyde) put into an Erlenmeyer flask of 4-5 liters capacity. Add 21.6 g of methylamine hydrochloride, 46.7 g of acetonedicarboxylic acid, and enough water to make a total volume of 2 liters. Adjust the pH to 8-10 by slowly adding a saturated solution of disodium phosphate. The condensate of this reaction (allow to set for about 6 days) is extracted with ether, the ethereal solution is dried over sodium sulphate and distilled, the product coming over at 113°C at 25 mm of pressure is collected. Upon cooling, 14 g of tropinone crystallizes in the pure state. Tropinone can also be obtained by oxidation of tropine with potassium dichromate, but I could not find the specifics for this operation.
Take the total amount of succinaldehyde (obtained from 4 of the above syntheses combined) and without further treatment or purification (this had better be 15.5 g of succindialdehyde) put into an Erlenmeyer flask of 4-5 liters capacity. Add 21.6 g of methylamine hydrochloride, 46.7 g of acetonedicarboxylic acid, and enough water to make a total volume of 2 liters. Adjust the pH to 8-10 by slowly adding a saturated solution of disodium phosphate. The condensate of this reaction (allow to set for about 6 days) is extracted with ether, the ethereal solution is dried over sodium sulphate and distilled, the product coming over at 113°C at 25 mm of pressure is collected. Upon cooling, 14 g of tropinone crystallizes in the pure state. Tropinone can also be obtained by oxidation of tropine with potassium dichromate, but I could not find the specifics for this operation.


'''2-Carbomethoxytropinone'''
===2-Carbomethoxytropinone===


A mixture of 1.35 g of sodium methoxide (this is sodium in a minimum amount of methanol), 3.5 g of tropinone, 4 ml of dimethylcarbonate and 10 ml of toluene is refluxed for 30 min. Cool to 0°C and add 15 ml of water that contains 2.5 g of ammonium chloride. Extract the solution after shaking with four 50 ml portions of chloroform, dry, evaporate the chloroform in vacuo. Dissolve the oil residue in 100 ml of ether, wash twice with a mixture of 6 ml of saturated potassium carbonate and three ml of 3 N KOH. Dry and evaporate in vacuo to recover the unreacted tropinone. Take up the oil in a solution of aqueous ammonium chloride and extract with chloroform, dry, and evaporate in vacuo to get an oil. The oil is dissolved in hot acetone, cool, and scratch inside of flask with glass rod to precipitate 2-carbomethoxytropinone. Recrystallize 16 g of this product in 30 ml of hot methyl acetate and add 4 ml of cold water and 4 ml of acetone. Put in freezer for 2.5-3 hours. Filter and wash the precipitate with cold methyl acetate to get pure product.
A mixture of 1.35 g of sodium methoxide (this is sodium in a minimum amount of methanol), 3.5 g of tropinone, 4 ml of dimethylcarbonate and 10 ml of toluene is refluxed for 30 min. Cool to 0°C and add 15 ml of water that contains 2.5 g of ammonium chloride. Extract the solution after shaking with four 50 ml portions of chloroform, dry, evaporate the chloroform in vacuo. Dissolve the oil residue in 100 ml of ether, wash twice with a mixture of 6 ml of saturated potassium carbonate and three ml of 3 N KOH. Dry and evaporate in vacuo to recover the unreacted tropinone. Take up the oil in a solution of aqueous ammonium chloride and extract with chloroform, dry, and evaporate in vacuo to get an oil. The oil is dissolved in hot acetone, cool, and scratch inside of flask with glass rod to precipitate 2-carbomethoxytropinone. Recrystallize 16 g of this product in 30 ml of hot methyl acetate and add 4 ml of cold water and 4 ml of acetone. Put in freezer for 2.5-3 hours. Filter and wash the precipitate with cold methyl acetate to get pure product.


'''Methylecgonine'''
===Methylecgonine===


0.4 mole of 2-Carbomethoxytropinone is suspended in 80 ml of ethanol in a Parr hydrogenation flask (or something that can take 100 psi and not react with the reaction, like stainless steel or glass). 10 g of Raney Nickle is added with good agitation (stirring or shaking) followed by 2-3 ml of 20% NaOH solution. Seal vessel, introduce 50 psi of hydrogen atmosphere (after flushing vessel with hydrogen) and heat to 40-50°C. After no more uptake of hydrogen (pressure gauge will hold steady after dropping to its lowest point) bleed off pressure and filter the nickle off, rinse out bottle with chloroform and use this rinse to rinse off the nickle while still on the filter paper. Make the filtrate basic with KOH after cooling to 10°C. Extract with chloroform dry, and evaporate the chloroform in vacuo to get an oil. Mix the oil plus any precipitate with an equal volume of dry ether and filter. Add more dry ether to the filtrate until no more precipitate forms, filter and add to the rest of the precipitate. Recrystallize from isopropanol to get pure methylecgonine. Test for activity. If active, skip down to the step for cocaine. If not active, proceed as follows. Stir with activated carbon for 30 min, filter, evaporate in vacuo, dissolve the brown liquid in methanol, and neutralize with 10% HCl acid in dry ether. Evaporate the ether until the two layers disappear, and allow to stand for 2 hours at 0°C to precipitate the title product. There are many ways to reduce 2-carbomethoxytropinone to methylecgonine. I chose to design a Raney Nickle reduction because it is cheap and not as suspicious as LAH and it is much easier than zinc or sodium amalgams.
0.4 mole of 2-Carbomethoxytropinone is suspended in 80 ml of ethanol in a Parr hydrogenation flask (or something that can take 100 psi and not react with the reaction, like stainless steel or glass). 10 g of Raney Nickle is added with good agitation (stirring or shaking) followed by 2-3 ml of 20% NaOH solution. Seal vessel, introduce 50 psi of hydrogen atmosphere (after flushing vessel with hydrogen) and heat to 40-50°C. After no more uptake of hydrogen (pressure gauge will hold steady after dropping to its lowest point) bleed off pressure and filter the nickle off, rinse out bottle with chloroform and use this rinse to rinse off the nickle while still on the filter paper. Make the filtrate basic with KOH after cooling to 10°C. Extract with chloroform dry, and evaporate the chloroform in vacuo to get an oil. Mix the oil plus any precipitate with an equal volume of dry ether and filter. Add more dry ether to the filtrate until no more precipitate forms, filter and add to the rest of the precipitate. Recrystallize from isopropanol to get pure methylecgonine. Test for activity. If active, skip down to the step for cocaine. If not active, proceed as follows. Stir with activated carbon for 30 min, filter, evaporate in vacuo, dissolve the brown liquid in methanol, and neutralize with 10% HCl acid in dry ether. Evaporate the ether until the two layers disappear, and allow to stand for 2 hours at 0°C to precipitate the title product. There are many ways to reduce 2-carbomethoxytropinone to methylecgonine. I chose to design a Raney Nickle reduction because it is cheap and not as suspicious as LAH and it is much easier than zinc or sodium amalgams.


'''Cocaine'''
===Cocaine===


4.15 g of methylecgonine and 5.7 g of benzoic anhydride in 150 ml of dry benzene are gently refluxed for 4 hours taking precaution against H<sub>2</sub>O in the air (drying tube). Cool in an ice bath, acidify carefully with hydrochloric acid, dry, and evaporate in a vacuum to get a red oil which is treated with a little portion of isopropanoi to precipitate cocaine.
4.15 g of methylecgonine and 5.7 g of benzoic anhydride in 150 ml of dry benzene are gently refluxed for 4 hours taking precaution against H<sub>2</sub>O in the air (drying tube). Cool in an ice bath, acidify carefully with hydrochloric acid, dry, and evaporate in a vacuum to get a red oil which is treated with a little portion of isopropanoi to precipitate cocaine.
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Below is given a somewhat easier method of producing tropinone by the general methods of Willstatter, who was instrumental in the first synthetic production of cocaine and several other alkaloids. After reviewing this method, I found it to be simpler than the above in many respects.
Below is given a somewhat easier method of producing tropinone by the general methods of Willstatter, who was instrumental in the first synthetic production of cocaine and several other alkaloids. After reviewing this method, I found it to be simpler than the above in many respects.


'''Tropinone'''
===Tropinone===


10 g of pyrrolidinediethyl diacetate are heated with 10 g of cymene and 2 g of sodium powder, the reaction taking place at about 160°C. During the reaction (which is complete in about 10 min) the temp should not exceed 172°C. The resulting reaction product is dissolved in water, then saturated with potassium carbonate, and the oil, which separates, is boiled with dilute sulfuric acid. 2.9 g of tropinone picrate forms and is filtered.
10 g of pyrrolidinediethyl diacetate are heated with 10 g of cymene and 2 g of sodium powder, the reaction taking place at about 160°C. During the reaction (which is complete in about 10 min) the temp should not exceed 172°C. The resulting reaction product is dissolved in water, then saturated with potassium carbonate, and the oil, which separates, is boiled with dilute sulfuric acid. 2.9 g of tropinone picrate forms and is filtered.
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Here are two more formulas devised by Willstatter that produce tropinone from tropine. Take note of the yield differences.
Here are two more formulas devised by Willstatter that produce tropinone from tropine. Take note of the yield differences.


'''Tropinone'''
===Tropinone===


To a solution of 25 g tropine, dissolved in 10 times its weight of 20% sulfuric acid are added 25 g of a 4% solution of potassium permanganate in 2 or 3 g portions over 45 min while keeping the temp at 10-12°C. The addition of permanganate will cause heat (keep the temp 10-12°C) and precipitation of manganese dioxide. The reaction mixture is complete in I hour. A large excess of NaOH is added and the reaction is steam distilled until I liter of distillate has been collected. The tropinone is isolated as the dibenzal compound by mixing the distillate with 40 g of benzaldehyde in 500 cc of alcohol and 40 g of 10% sodium hydroxide solution. Let stand several days to get dibenzaltropinone as yellow needles. Yield: 15.5 g, 28%. Recrystallize from ethanol to purify.
To a solution of 25 g tropine, dissolved in 10 times its weight of 20% sulfuric acid are added 25 g of a 4% solution of potassium permanganate in 2 or 3 g portions over 45 min while keeping the temp at 10-12°C. The addition of permanganate will cause heat (keep the temp 10-12°C) and precipitation of manganese dioxide. The reaction mixture is complete in I hour. A large excess of NaOH is added and the reaction is steam distilled until I liter of distillate has been collected. The tropinone is isolated as the dibenzal compound by mixing the distillate with 40 g of benzaldehyde in 500 cc of alcohol and 40 g of 10% sodium hydroxide solution. Let stand several days to get dibenzaltropinone as yellow needles. Yield: 15.5 g, 28%. Recrystallize from ethanol to purify.


'''Tropinone'''
===Tropinone===


A solution of 12 g of chromic acid in the same amount of water (12 g) and 60 g of glacial acetic acid is added dropwise with stirring over a period of 4 hours to a solution of 25 g of tropine in 500 mL of glacial acetic acid that has been warmed to 60-70°C and is maintained at this temp during the addition. Heat the mixture for a short time on a steam bath until all the chromic acid has disappeared, cool and make strongly alkaline with NaOH. Extract with six 500 mL portions of ether and evaporate the ether in vacuo to get an oil that crystallizes readily. Purify by converting to the picrate or fractionally distill, collecting the fraction at 224-225°C at 714 mm vacuo.
A solution of 12 g of chromic acid in the same amount of water (12 g) and 60 g of glacial acetic acid is added dropwise with stirring over a period of 4 hours to a solution of 25 g of tropine in 500 mL of glacial acetic acid that has been warmed to 60-70°C and is maintained at this temp during the addition. Heat the mixture for a short time on a steam bath until all the chromic acid has disappeared, cool and make strongly alkaline with NaOH. Extract with six 500 mL portions of ether and evaporate the ether in vacuo to get an oil that crystallizes readily. Purify by converting to the picrate or fractionally distill, collecting the fraction at 224-225°C at 714 mm vacuo.
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The tropinones can be used in the above formula (or in a formula that you have found elsewhere) to be converted to cocaine. Remember to recrystallize the 2-Carbomethoxytropinone before converting to methylecgonine.
The tropinones can be used in the above formula (or in a formula that you have found elsewhere) to be converted to cocaine. Remember to recrystallize the 2-Carbomethoxytropinone before converting to methylecgonine.


==Semi-Synthetic Synthesis==
==See also==
 
* [[Indoor cultivation of coca plants]]
__NOTOC__
<nomobile>{{decree|type=delete|message=WARNING!!! The anticholinergic tropane alkaloids used are EXTREMELY POISONOUS and can be ABSORBED THROUGH THE SKIN!!! Please take EXTREME precautions when handling these plants and the resulting anticholinergic tropane alkaloids that lie within. You must give these plants great respect or they will punish you severely. In lieu of waterproof lab attire, using large disposable trash bags to cover the head, body, legs, and arms, as well as safety glasses for the face is ABSOLUTELY NECESSARY!!! Physostigmine, a cholinergic agent, is the chemical used to reverse the anticholinergic effects and poisoning of the tropane alkaloids. It occurs naturally in the Calabar bean and the fruit of the Manchineel tree. It is an extremely toxic substance with a mechanism of action similar to nerve gas.}}</nomobile>
 
'''Overview'''
 
Here we are obtaining tropine to create tropinone from a natural source; the anticholinergic tropane alkaloids such as [[atropine]], [[scopolamine]], [[hyocyamine]], mandragovine, and other similar [[Tropane Alkaloids|tropane alkaloids]] obtained from the plants in the [https://en.wikipedia.org/wiki/Solanaceae Solanaceae family], such Belladonna, Datura, Henbane, Brugmansia, and Mandrake. Tropane alkaloids all contain the tropane ring which, when separated from the tropic, scopic, and hyoscopic, and similar acids becomes tropine, which we can use as a source chemical to produce tropinone, which is necessary for creation of synthetic cocaine. These plants grow in most of the parts of the world. By using this route to produce cocaine the plants can be grown in country, so the cocaine does not need to be transported very far, making it extremely cheap. With this semi-synthetic synthesis we can grow these plants nearly anywhere in the world, make cocaine cheaply within the country without having to transport it or cut it, to ensure harm reduction and that the cartels, traffickers, and other such dangerous criminals are out of a f*cking job.
 
'''Extraction'''
 
A boiling water extraction is used to extract the [[Tropane Alkaloids|tropane alkaloids]] from the plant material. A sheet of cloth as a filter is put down in a container and water is boiled in said container. The plants are then pulled up by the roots, washed with water, and then placed in the container and pulverized and macerated while under the water with an appropriate utensil such as a piece of wood or a pipe. Keeping a lid on the container at all times will preclude spattering, which could absorb through your skin giving you anticholinergic poisoning. After the brew has boiled for some time pull up the cloth as a filter, leaving the extracted alkaloids in the water. Boil down the water for a concentrated solution of [[Tropane Alkaloids|tropane alkaloids]]. Multiple extractions of the same plant matter, and multiple extractions of different plant matter from another vessel(s) and transferred and boiled down in the main vessel will result in a concentrated aqueous solution of [[Tropane Alkaloids|tropane alkaloids]].
 
'''Hydrolysis'''
 
The concentrated solution of [[Tropane Alkaloids|tropane alkaloids]] has sodium hydroxide (NaOH or lye) added to it, which binds with the hydrolyzed acids to make sodium acid salts and tropine in the aqueous solution. The solution can be boiled down and the tropine extracted with anhydrous ethanol for the two above tropinone syntheses involving tropine.
 
'''Hydrogenation'''


For the hydrogenation reaction above we can use a (sealable) conductive metal container or two conductive metal objects in the ethanoic solution containing the NaOH acting as an electrolyte. We can set up an electrolysis reaction for a sort of sparging situation where hydrogen bubbles up through the (sealable) metal container acting like a hydrogenator. We can use any electricity source we choose, sealing the metal container and allowing the hydrogen gas to bubble up through the ethanoic solution, hydrogenating the 2-Carbomethoxytropinone into methylecgonine. This setup may be much easier and less suspicious than a conventional hydrogenator and can be done in-situ.
==External links==
* [https://erowid.org/archive/rhodium/chemistry/cocainesynth.buzz.html Cocaine Synthesis from "Recreational Drugs" by Professor Buzz] (Rhodium archive at Erowid)


'''Fractional Crystallization'''
[[category:Chemical synthesis]]
,
Cocaine has 16 sterioisomers, different configurations of the cocaine molecule. One of these is the cocaine we are looking for, the other sterioisomers are either inactive, or may be toxic. Since the sterioisomers have the same molecular mass we cannot use chromatography or distillation to separate them. Instead we dissolve the hydrochloride sterioisomers in a heated, aqueous supersaturated solution and then use a seed crystal of the cocaine isomer we are looking for and then lower the temperature of the supersaturated solution. This causes the correct cocaine sterioisomer to crystallize on the seed crystal. This is fractional crystallization and separates the correct sterioisomer from the rest of the other sterioisomers. A cocaine seed crystal can be obtained from an anhydrous acetone wash of street cocaine. Cocaine hydrochloride is completely insoluble in pure, anhydrous acetone, but all cutting agents are, dissolving them away leaving pure cocaine hydrochloride crystals, which can then be used for our fractional crystallization process.

Latest revision as of 08:58, 6 July 2025

Legality

Disclaimer:

This guide is provided for informational and educational purposes only. We do not encourage you to break the law and cannot claim any responsibility for your actions.

Several precursors listed in the recipes below are governed by international treaties, specifically the United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances (1988), which mandates control over substances frequently used in the illicit manufacture of narcotic drugs:

  • Benzaldehyde
  • Methylamine
  • Potassium permanganate

Cocaine Synthesis from "Recreational Drugs" by Professor Buzz

Although this drug is categorized as a local anesthetic, I have chosen to put it in with the hallucinogens because of the psychotomimetic effects that it produces. Cocaine is not a phenylethylamine, but it produces central nervous system arousal or stimulant effects which closely resemble those of the amphetamines, the methylenedioxyamphetamines in particular. This is due to the inhibition by cocaine of re-uptake of the norepinepherine released by the adrenergic nerve terminals, leading to an enhanced adrenergic stimulation of norepinephrine receptors. The increased sense of well being and intense, but short lived, euphoric state produced by cocaine requires frequent administration.

Cocaine does not penetrate the intact skin, but is readily absorbed from the mucus membranes, creating the need to snort it. This accounts for the ulceration of the nasal septum after cocaine has been snorted for long periods.

The basic formula for cocaine starts by purchasing or making tropinone, converting the tropinone into 2- carbomethoxytropinone (also known as methyl-tropan-3-one-2-carboxylate), reducing this to ecgonine, and changing that to cocaine. Sounds easy? It really is not very simple, but with Reagan's new drug policies, cracking down on all of the drug smuggling at the borders, this synthetic cocaine may be the source of the future. This synthesis is certainly worth performing with the high prices that cocaine is now commanding. As usual, I will start with the precursors and intermediates leading up to the product.

Succindialdehyde

This can be purchased, too. 23.2 g of succinaldoxime powder in 410 ml of 1 N sulfuric acid and add dropwise with stirring at 0°C a solution of 27.6 g of sodium nitrite in 250 ml of water over 3 hours. After the addition, stir and let the mixture rise to room temp for about 2 hours, taking care not to let outside air into the reaction. Stir in 5 g of Ba carbonate and filter. Extract the filtrate with ether and dry, evaporate in vacuo to get the succindialdehyde. This was taken from JOC, 22, 1390 (1957). To make succinaldoxime, see JOC, 21, 644 (1956).

Complete Synthesis of Succindialdehyde

JACS, 68, 1608 (1946)

In a 2 liter 3 necked flask equipped with a stirrer, reflux condenser, and an addition funnel, is mixed 1 liter of ethanol, 67 g of freshly distilled pyrrole, and 141 g of hydroxylamine hydrochloride. Heat to reflux until dissolved, add 106 g of anhydrous sodium carbonate in small portions as fast as reaction will allow. Reflux for 24 hours and filter the mixture. Evaporate the filtrate to dryness under vacuo. Take up the residue in the minimum amount of boiling water, decolorize with carbon, filter and allow to recrystallize in refrigerator. Filter to get product and concentrate to get additional crop. Yield of succinaldoxime powder is a little over 40 g, mp is 171-172°C.

5.8 g of the above powder is placed in a beaker of 250 ml capacity and 54 ml of 10% sulfuric acid is added. Cool to 0°C and add in small portions of 7 g of sodium nitrite (if you add the nitrite too fast, nitrogen dioxide fumes will evolve). After the dioxime is completely dissolved, allow the solution to warm to 20°C and effervescence to go to completion. Neutralize the yellow solution to litmus by adding small portions of barium carbonate. Filter off the barium sulfate that precipitates. The filtrate is 90% pure succindialdehyde and is not purified further for the reaction to create tropinone. Do this procedure 3 more times to get the proper amount for the next step, or multiply the amounts given by four and proceed as described above.

Take the total amount of succinaldehyde (obtained from 4 of the above syntheses combined) and without further treatment or purification (this had better be 15.5 g of succindialdehyde) put into an Erlenmeyer flask of 4-5 liters capacity. Add 21.6 g of methylamine hydrochloride, 46.7 g of acetonedicarboxylic acid, and enough water to make a total volume of 2 liters. Adjust the pH to 8-10 by slowly adding a saturated solution of disodium phosphate. The condensate of this reaction (allow to set for about 6 days) is extracted with ether, the ethereal solution is dried over sodium sulphate and distilled, the product coming over at 113°C at 25 mm of pressure is collected. Upon cooling, 14 g of tropinone crystallizes in the pure state. Tropinone can also be obtained by oxidation of tropine with potassium dichromate, but I could not find the specifics for this operation.

2-Carbomethoxytropinone

A mixture of 1.35 g of sodium methoxide (this is sodium in a minimum amount of methanol), 3.5 g of tropinone, 4 ml of dimethylcarbonate and 10 ml of toluene is refluxed for 30 min. Cool to 0°C and add 15 ml of water that contains 2.5 g of ammonium chloride. Extract the solution after shaking with four 50 ml portions of chloroform, dry, evaporate the chloroform in vacuo. Dissolve the oil residue in 100 ml of ether, wash twice with a mixture of 6 ml of saturated potassium carbonate and three ml of 3 N KOH. Dry and evaporate in vacuo to recover the unreacted tropinone. Take up the oil in a solution of aqueous ammonium chloride and extract with chloroform, dry, and evaporate in vacuo to get an oil. The oil is dissolved in hot acetone, cool, and scratch inside of flask with glass rod to precipitate 2-carbomethoxytropinone. Recrystallize 16 g of this product in 30 ml of hot methyl acetate and add 4 ml of cold water and 4 ml of acetone. Put in freezer for 2.5-3 hours. Filter and wash the precipitate with cold methyl acetate to get pure product.

Methylecgonine

0.4 mole of 2-Carbomethoxytropinone is suspended in 80 ml of ethanol in a Parr hydrogenation flask (or something that can take 100 psi and not react with the reaction, like stainless steel or glass). 10 g of Raney Nickle is added with good agitation (stirring or shaking) followed by 2-3 ml of 20% NaOH solution. Seal vessel, introduce 50 psi of hydrogen atmosphere (after flushing vessel with hydrogen) and heat to 40-50°C. After no more uptake of hydrogen (pressure gauge will hold steady after dropping to its lowest point) bleed off pressure and filter the nickle off, rinse out bottle with chloroform and use this rinse to rinse off the nickle while still on the filter paper. Make the filtrate basic with KOH after cooling to 10°C. Extract with chloroform dry, and evaporate the chloroform in vacuo to get an oil. Mix the oil plus any precipitate with an equal volume of dry ether and filter. Add more dry ether to the filtrate until no more precipitate forms, filter and add to the rest of the precipitate. Recrystallize from isopropanol to get pure methylecgonine. Test for activity. If active, skip down to the step for cocaine. If not active, proceed as follows. Stir with activated carbon for 30 min, filter, evaporate in vacuo, dissolve the brown liquid in methanol, and neutralize with 10% HCl acid in dry ether. Evaporate the ether until the two layers disappear, and allow to stand for 2 hours at 0°C to precipitate the title product. There are many ways to reduce 2-carbomethoxytropinone to methylecgonine. I chose to design a Raney Nickle reduction because it is cheap and not as suspicious as LAH and it is much easier than zinc or sodium amalgams.

Cocaine

4.15 g of methylecgonine and 5.7 g of benzoic anhydride in 150 ml of dry benzene are gently refluxed for 4 hours taking precaution against H2O in the air (drying tube). Cool in an ice bath, acidify carefully with hydrochloric acid, dry, and evaporate in a vacuum to get a red oil which is treated with a little portion of isopropanoi to precipitate cocaine.

As you can see, this is quite a chore. The coca leaves give ecgonine, which as you can see, is only a jump away from cocaine. If you can get egconine, then dissolve 8.5 g of it in 100 ml of ethanol and pass (bubble) dry HCl gas through this solution for 30 min. Let cool to room temp and let stand for another 1.5 hours. Gently reflux for 30 min and evaporate in vacuo. Basify the residue oil with NaOH and filter to get 8.4 g of methylecgonine, which is converted to cocaine as in the cocaine step above.

Below is given a somewhat easier method of producing tropinone by the general methods of Willstatter, who was instrumental in the first synthetic production of cocaine and several other alkaloids. After reviewing this method, I found it to be simpler than the above in many respects.

Tropinone

10 g of pyrrolidinediethyl diacetate are heated with 10 g of cymene and 2 g of sodium powder, the reaction taking place at about 160°C. During the reaction (which is complete in about 10 min) the temp should not exceed 172°C. The resulting reaction product is dissolved in water, then saturated with potassium carbonate, and the oil, which separates, is boiled with dilute sulfuric acid. 2.9 g of tropinone picrate forms and is filtered.

Here are two more formulas devised by Willstatter that produce tropinone from tropine. Take note of the yield differences.

Tropinone

To a solution of 25 g tropine, dissolved in 10 times its weight of 20% sulfuric acid are added 25 g of a 4% solution of potassium permanganate in 2 or 3 g portions over 45 min while keeping the temp at 10-12°C. The addition of permanganate will cause heat (keep the temp 10-12°C) and precipitation of manganese dioxide. The reaction mixture is complete in I hour. A large excess of NaOH is added and the reaction is steam distilled until I liter of distillate has been collected. The tropinone is isolated as the dibenzal compound by mixing the distillate with 40 g of benzaldehyde in 500 cc of alcohol and 40 g of 10% sodium hydroxide solution. Let stand several days to get dibenzaltropinone as yellow needles. Yield: 15.5 g, 28%. Recrystallize from ethanol to purify.

Tropinone

A solution of 12 g of chromic acid in the same amount of water (12 g) and 60 g of glacial acetic acid is added dropwise with stirring over a period of 4 hours to a solution of 25 g of tropine in 500 mL of glacial acetic acid that has been warmed to 60-70°C and is maintained at this temp during the addition. Heat the mixture for a short time on a steam bath until all the chromic acid has disappeared, cool and make strongly alkaline with NaOH. Extract with six 500 mL portions of ether and evaporate the ether in vacuo to get an oil that crystallizes readily. Purify by converting to the picrate or fractionally distill, collecting the fraction at 224-225°C at 714 mm vacuo.

The tropinones can be used in the above formula (or in a formula that you have found elsewhere) to be converted to cocaine. Remember to recrystallize the 2-Carbomethoxytropinone before converting to methylecgonine.

See also

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