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CN109020813A - 一种制备α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的新方法 - Google Patents

一种制备α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的新方法 Download PDF

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CN109020813A
CN109020813A CN201710438211.7A CN201710438211A CN109020813A CN 109020813 A CN109020813 A CN 109020813A CN 201710438211 A CN201710438211 A CN 201710438211A CN 109020813 A CN109020813 A CN 109020813A
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ester
acid
trichloroethanol
dimethoxyphenyl
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林文翰
张庆英
刘�东
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Peking University
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00Preparation of carboxylic acid esters
    • C07C67/30Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/307Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of halogen; by substitution of halogen atoms by other halogen atoms
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/09Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00Preparation of carboxylic acid esters
    • C07C67/08Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00Preparation of carboxylic acid esters
    • C07C67/30Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/31Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of functional groups containing oxygen only in singly bound form
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00Preparation of carboxylic acid esters
    • C07C67/30Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/313Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of doubly bound oxygen containing functional groups, e.g. carboxyl groups

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  • Organic Chemistry (AREA)
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  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

本发明公开了一种制备片螺素类生物碱合成关键中间体α‑溴代‑3,4‑二甲氧基苯乙酸三氯乙醇酯的方法。和甲酯及其类似物的方法。1)以1,2‑二甲氧基苯(CAS:91‑16‑7)和草酰氯甲酯(CAS:5781‑53‑3)为起始原料,在三氯化铝条件下反应,得到3‑(3,4二甲氧基苯基)‑二羟醋酸甲酯(CAS:38209‑58‑4),通过氢氧化钠碱水解,得到3‑(3,4二甲氧基苯基)‑二羟醋酸(产物Ⅰ);2)产物Ⅰ与三氯乙醇在二环己基碳二亚胺(DCC)下反应,得到3‑(3,4二甲氧基苯基)‑二羟醋酸三氯乙醇酯(产物Ⅱ);3)利用硼氢化钠还原产物Ⅱ,得到α‑羟基‑3,4‑二甲氧基苯乙酸三氯乙醇酯(产物Ⅲ);4)产物Ⅲ与溴化磷酰反应,得目标产物α‑溴代‑3,4‑二甲氧基苯乙酸三氯乙醇酯。本发明的制备方法步骤少,工艺简便,无需贵金属催化、产率较高。

Description

一种制备α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的新方法
技术领域
本发明涉及一种制备片螺素类生物碱合成关键中间体α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的方法。
背景技术
片螺素类生物碱Baculiferin L(见下式)是在2010年由中国学者首次从海绵Iotrochota baculifera中分离鉴定的具有显著抗HIV活性的化合物(Guotao Fan,WenhanLin,et al.Bioorganic&Medicinal Chemistry,2010,18,5466–5474)。该化合物具有较好的新型抗艾滋病药物开发潜力,但受限于原料药来源于海绵动物,严重限制了其药效学等的深入研究。Baculiferin L的全合成路线已经由中国学者摸索成功,并成功实现了在实验室条件下10克级以下Baculiferin L的制备纯化(Qingjiang Li,Aili Fan,et al.OrganicLetters,2010,12,4066-4069),而α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯是化学全合成Baculiferin L的一个关键性中间体,其制备工艺的优化对于Baculiferin L的规模化制备效率的提高具有重要意义。
发明内容
本发明的目的之一是提供一种合成α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的新方法,具体包括:
1)以1,2-二甲氧基苯(CAS:91-16-7)和草酰氯甲酯(CAS:5781-53-3)为起始原料,在三氯化铝条件下反应,得到3-(3,4二甲氧基苯基)-二羟醋酸甲酯(CAS:38209-58-4),通过氢氧化钠碱水解,得到3-(3,4二甲氧基苯基)-二羟醋酸(产物Ⅰ);
2)产物Ⅰ与三氯乙醇在二环己基碳二亚胺(DCC)下反应,得到3-(3,4二甲氧基苯基)-二羟醋酸三氯乙醇酯(产物Ⅱ);
3)利用硼氢化钠还原产物Ⅱ,得到α-羟基-3,4-二甲氧基苯乙酸三氯乙醇酯(产物Ⅲ);
4)产物Ⅲ与溴化磷酰反应,得目标产物α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯。
附图说明
图1.α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的合成路线图。
具体实施方案:
本发明所公开的技术内容,是为了让本领域技术人员更好的理解本发明的实质,下述实施方案仅作示例。
1公斤的草酰氯单甲酯和3升的DCM加入到10升的反应瓶,干冰丙酮冷却,冷到0度左右,1160克的三氯化铝分批加入,有升温,溶液变红;最高温度10度;搅拌半小时;冷至零度,滴加1000克的3,4-二甲氧基苯的DCM(1升)溶液,升温很明显,控制温度10-15度;滴完后TLC薄层层析跟踪反应,5小时后基本反应完全;可能有5%以下的原料残余。
准备3公斤的冰水,将反应液缓慢倒入冰水中,开始时放热很剧烈,搅拌要快,猝灭完后搅拌1小时,分液,DCM层饱和食盐水1500mL洗一次,干燥浓缩,得到中间体B-1粗品1.71公斤。
1.71公斤B-1粗品溶于2升的THF,预先配好的氢氧化钠溶液(600克氢氧化钠溶于3升的水中)冷至室温,一起加入10升的反应瓶,有固体析出;室温搅拌16小时;1200mL浓盐酸调PH3-4,乙酸乙酯萃取三次,每次1500mL;合并有机层,饱和食盐水洗涤,干燥浓缩得到1230克黄色固体,中间体B-2,两步收率82%。
1230克中间体B-2,1800克三氯乙醇,50克DMAP,5升的DCM加入到10升的反应瓶中,未全溶;冰水浴至0-10度,滴加DCC的DCM溶液(1330克DCC溶于1升的DCM中),机械搅拌,大量白色固体析出;滴加完毕后室温搅拌3小时;抽滤,固体用少量DCM洗涤;滤液饱和食盐水洗涤一次,干燥浓缩得到固体1980克,中间体B-3收率85%。
500克B-3,1500mLTHF和300mL水加入到反应瓶中,冰盐浴冷却到零下5-零度间;20克的硼氢化钠分批次加入,每次1-2克;控温不超过零度,加料的过程中每15分钟取样点板,原料一消失马上加入500mL1N的稀盐酸猝灭反应,加入EA萃取两次,每次1升;合并有机层,饱和食盐水洗涤,干燥浓缩,得到粗品400克,中间体B-4;有时会有明显的杂点。
400克的中间体B-4溶于800mLDCM中,加入反应瓶中,冰水浴;200克三溴氧磷溶于600mLDCM,滴加到反应瓶中,控温10度以下;滴完后室温反应4小时,倒入800mL冰水中,分液,有机层干燥浓缩过柱,得到160克白色固体,中间体B;两步收率34%。

Claims (1)

1.一种制备α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯(式I)的方法,包括如下步骤:
1)以1,2-二甲氧基苯(CAS:91-16-7)和草酰氯甲酯(CAS:5781-53-3)为起始原料,在三氯化铝条件下反应,得到3-(3,4二甲氧基苯基)-二羟醋酸甲酯(CAS:38209-58-4),通过氢氧化钠碱水解,得到3-(3,4二甲氧基苯基)-二羟醋酸(产物Ⅰ);
2)产物Ⅰ与三氯乙醇在二环己基碳二亚胺(DCC)下反应,得到3-(3,4二甲氧基苯基)-二羟醋酸三氯乙醇酯(产物Ⅱ);
3)利用硼氢化钠还原产物Ⅱ,得到α-羟基-3,4-二甲氧基苯乙酸三氯乙醇酯(产物Ⅲ);
4)产物Ⅲ与溴化磷酰反应,得目标产物α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯。
CN201710438211.7A 2017-06-12 2017-06-12 一种制备α-溴代-3,4-二甲氧基苯乙酸三氯乙醇酯的新方法 Pending CN109020813A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112374966A (zh) * 2020-11-26 2021-02-19 福安药业集团重庆礼邦药物开发有限公司 一种水合氯醛的制备方法

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WO2000040557A1 (en) * 1999-01-08 2000-07-13 Vertex Pharmaceuticals Incorporated Process for the formation of intermediates useful for the preparation of pharmaceuticals
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112374966A (zh) * 2020-11-26 2021-02-19 福安药业集团重庆礼邦药物开发有限公司 一种水合氯醛的制备方法
CN112374966B (zh) * 2020-11-26 2023-03-31 福安药业集团重庆礼邦药物开发有限公司 一种水合氯醛的制备方法

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Application publication date: 20181218