CN105315274A - Process for synthesizing quinuclidine hydrochloride - Google Patents

Process for synthesizing quinuclidine hydrochloride Download PDF

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Publication number
CN105315274A
CN105315274A CN201410317125.7A CN201410317125A CN105315274A CN 105315274 A CN105315274 A CN 105315274A CN 201410317125 A CN201410317125 A CN 201410317125A CN 105315274 A CN105315274 A CN 105315274A
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China
Prior art keywords
rubane
work
hydrochloride
ethyl
extraction
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CN201410317125.7A
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Chinese (zh)
Inventor
席平安
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Shanghai Bosheng Biotechnology Co Ltd
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Shanghai Bosheng Biotechnology Co Ltd
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Priority to CN201410317125.7A priority Critical patent/CN105315274A/en
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  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A process for synthesizing quinuclidine hydrochloride includes the steps of esterification, addition, condensation, de-carboxylation and finally reduction to prepare the quinuclidine hydrochloride with 4-piperidine formic acid as a start raw material.

Description

A kind of technique for the synthesis of rubane hydrochloride
Technical field
For the synthesis of a technique for rubane hydrochloride, be with 4-piperidine carboxylic acid for starting raw material, through esterification, addition, condensation, decarboxylation, then obtain rubane hydrochloride through reduction.
Background technology
Rubane is the complexing agent of organometallic compound, and it is also important medicine intermediate simultaneously, the emphasis being domestic and international pharmaceutical industries research always and paying close attention to.Document (JournaloftheChemicalSociety; 1937; 1989) report two kinds with 3-quininone hydrochlorate for starting raw material is to synthesize the method for rubane: one, with 3-quininone hydrochlorate for starting raw material, take hydrazine hydrate as reductive agent, in sodium ethylate/ethanol system, obtain target compound through high pressure, pyroreaction.Synthetic route have employed high pressure-temperature, and operation inconvenience, unsuitable industry's enlarging production; Two, with 3-Quinuclidinone hydrochloride for starting raw material, take zinc amalgam as reductive agent, concentrated hydrochloric acid exist under backflow obtain target compound.The zinc amalgam reagent adopted in route, and the preparation of zinc amalgam itself just needs to use the contour toxic agent of mercury bichloride, this just greatly limit the feasibility of its suitability for industrialized production.So, find a kind of comparatively safe, with low cost while can the method for large-scale industrial production, be the emphasis that researchist pays close attention to all the time.
Summary of the invention
Technical scheme of the present invention is: for the synthesis of the technique of rubane hydrochloride, with 4-piperidine carboxylic acid for starting raw material, through esterification, addition, condensation, decarboxylation, then obtains rubane hydrochloride through reduction.Reduction obtains rubane hydrochloride.
The synthesis of rubane hydrochloride (V), is realized by following step:
1) method one: get 1Kg quininone (I work work) hydrochloride, under condition of ice bath in a small amount repeatedly join in the sodium hydroxide solution of the 2N of 2.9L, then 65.6g sodium carbonate solid is added, stir 0.5h, then methylene dichloride (1.5L × 3) is used to extract, combined dichloromethane layer, anhydrous sodium sulfate drying, concentrate drying obtains 670g intermediate quininone, yield 87%.Repeatedly joined at leisure in 1.3L95% hydrazine hydrate on a small quantity by above-mentioned quininone, then 120 DEG C of heated overnight at reflux, cooling, place 3h in 0 DEG C, crystal is separated out.Filter, the crystal tertiary butyl ether rinsing of 800mL 3 times, the mother liquor of filtration is placed refrigerator and is repeated aforesaid operations, merges and obtains white crystal 3-rubane hydrazone 670g.Above-mentioned 67093-rubane hydrazone, alkali (the present embodiment is 810g potassium hydroxide) and 3.4L high-boiling point alcohol (can be the water soluble high boiling point alcohols such as ethylene glycol, tirethylene glycol, triethylene Glycol) 175 DEG C are stirred 5 ~ 6h (wherein having a large amount of nitrogen to produce).Cooling, pressure reducing and steaming 2.5L high-boiling point alcohol, (3L × 3) extraction is carried out, anhydrous sodium sulfate drying with methylene dichloride or trichloromethane or tetracol phenixin or 1,2-ethylene dichloride etc., rapid filtration, in the 2N ethyl acetate hydrogen chloride solution stirred under pouring 2.5L ice bath at leisure into, concentrated, filter, gained white solid is recrystallization in 1.0L Virahol or methyl alcohol or ethanol or n-propyl alcohol, cold filtration obtains rubane hydrochloride 500g, yield 70%.Purity: 99.5%.
2) method two: get 1Kg quininone (work I work) hydrochloride, under condition of ice bath in a small amount repeatedly join in the sodium hydroxide solution of the 2N of 2.9L, then 65.6g sodium carbonate solid is added, stir 0.5h, then methylene dichloride (1.5L × 3) is used to extract, combined dichloromethane layer, anhydrous sodium sulfate drying, concentrate drying obtains 665g intermediate quininone.Repeatedly joined at leisure in 1.3L95% hydrazine hydrate on a small quantity by above-mentioned quininone, then 120 DEG C of heated overnight at reflux, cooling, place 3h in 0 DEG C, crystal is separated out.Filter, the crystal tertiary butyl ether rinsing of 800mL 3 times, the mother liquor of filtration is placed refrigerator and is repeated aforesaid operations, merges and obtains white crystal 3-rubane hydrazone 668g.Above-mentioned 66893-rubane hydrazone, 2300g potassium tert.-butoxide (triplication) and 3.4L ethylene glycol 175 DEG C are stirred 5 ~ 6h (wherein having a large amount of nitrogen to produce).Cooling, pressure reducing and steaming 2.5L ethylene glycol, with methylene dichloride (3L × 3) extraction, anhydrous sodium sulfate drying, rapid filtration, stir in the ethyl acetate hydrogen chloride solution of 2N under pouring 2.5L ice bath at leisure into, concentrated, filter, gained white solid is recrystallization in 1.0L Virahol, cold filtration obtains rubane hydrochloride 400g, yield 56%.Purity: 99%.
Accompanying drawing explanation
Fig. 1 is synthesis rubane hydrochloride process figure.

Claims (5)

1. for the synthesis of a technique for rubane hydrochloride, it is characterized in that, comprise the following steps:
1) in alcoholic solvent, piperidine carboxylic acid (I) and sulfur oxychloride react under condition of ice bath, after, drip halogenated acetic acids ethyl ester, temperature rising reflux 1-3h, be down to less than 50 DEG C, process filtrate, through extraction, merges organic phase, drying, suction filtration, filtrate concentrate, and obtain oily object---1-ethoxy carbonyl acyl ethyl-4-piperidine ethyl formate (work work);
2) 1-ethoxy carbonyl acyl ethyl-4-piperidine ethyl formate (work work) and toluene react in the basic conditions, system temperature 80-90 DEG C, solvent in system is boiled off to system temperature 80 ~ 110 DEG C under normal pressure, reaction 6 ~ 10h, after question response, stopped reaction, be down to room temperature, add diluted acid to stir, leave standstill and separate aqueous phase, again to toluene mutually in add diluted acid, stir, leave standstill and separate aqueous phase, merge aqueous phase, be warming up to 110 ~ 120 DEG C of decarboxylation 8 ~ 12h that are hydrolyzed, stopped reaction, remove moisture under reduced pressure, be down to room temperature, add acid in alkali He unnecessary, pH is adjusted to be 10 ~ 12, extraction, dry, suction filtration, concentrated, obtain brown solid powder---quinuclidone (work I work),
3) by a small amount of for above-mentioned quinuclidone (II work) repeatedly slowly join in hydrazine hydrate, heated overnight at reflux at 110 ~ 120 DEG C, cooling, crystallization.Filter, washing crystal, the mother liquor after washing and filtering puts into refrigerator repetitive operation, merge to obtain more white crystal 3-rubane hydrazones, this white crystal 3-rubane hydrazone and doses alkali, high-boiling point alcohol are stirred 5 ~ 6h, cooling, pressure reducing and steaming high-boiling point alcohol, extraction, dry, filter, in the ethyl acetate/hydrogen chloride solution stirred under slowly pouring ice bath into, concentrated, filter, reflux in Virahol or methyl alcohol or ethanol or n-propyl alcohol, cools to obtain rubane hydrochloride (V).
2. the synthesis technique of rubane hydrochloride according to claim 1, is characterized in that, described step 1) in alcoholic solvent be ethanol, halogenated acetic acids ethyl ester is bromoethyl acetate or ethyl chloroacetate.
3. the synthesis technique of rubane hydrochloride according to claim 1, is characterized in that, described step 2) in alkaline condition be the solution of sodium ethylate, potassium ethylate, potassium tert.-butoxide or basic metal and alcohol direct reaction.
4. the synthesis technique of rubane hydrochloride according to claim 1, is characterized in that, described step 3) in alkali be potassium hydroxide, sodium ethylate or potassium tert.-butoxide, its used in molar ratio is 3 times amount of white crystal 3-rubane hydrazone.
5. the synthesis technique of rubane hydrochloride according to claim 1, is characterized in that, described step 3) in extraction be take methylene dichloride or trichloromethane or tetracol phenixin or 1,2-ethylene dichloride to extract.
CN201410317125.7A 2014-07-04 2014-07-04 Process for synthesizing quinuclidine hydrochloride Pending CN105315274A (en)

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CN105315274A true CN105315274A (en) 2016-02-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110922401A (en) * 2018-09-19 2020-03-27 广东东阳光药业有限公司 Preparation method of quininone derivative

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110922401A (en) * 2018-09-19 2020-03-27 广东东阳光药业有限公司 Preparation method of quininone derivative
CN110922401B (en) * 2018-09-19 2022-07-26 广东东阳光药业有限公司 Preparation method of quinuclidone derivative

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