CN102060733B - (7-甲氧基-3,4-二氢-1-萘基)乙腈的制备方法 - Google Patents

(7-甲氧基-3,4-二氢-1-萘基)乙腈的制备方法 Download PDF

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CN102060733B
CN102060733B CN201010590808.1A CN201010590808A CN102060733B CN 102060733 B CN102060733 B CN 102060733B CN 201010590808 A CN201010590808 A CN 201010590808A CN 102060733 B CN102060733 B CN 102060733B
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马庆双
李宗文
邹元华
张围宇
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Dijia Pharmaceutical Group Co ltd
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Weihai Disu Pharmaceutical Co Ltd
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Abstract

本发明公开了一种工业合成阿戈美拉汀中间体(7-甲氧基-3,4-二氢-1-萘基)乙腈的新方法,采用氰基乙酸与7-甲氧基-1-四氢萘酮为起始原料,在含有催化量醋酸铵和哌啶中进行,反应产率可达91%以上,适于工业应用。

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(7-甲氧基-3,4-二氢-1-萘基)乙腈的制备方法
技术领域
本发明涉及工业合成(7-甲氧基-3,4-二氢-1-萘基)乙腈的新方法,以及该化合物在阿戈美拉汀工业生产中的应用。背景技术 
阿戈美拉汀(Agomelatine)是法国Servier公司开发的第一个耙向褪黑素激素的抗抑郁药,也是同时用作MT1和MT2褪黑激素受体激动剂和5-HT2c拮抗剂的首个抗抑郁药。与传统的选择性5-羟色胺再摄取抑制剂(SSRI)和5-羟色胺去甲肾上腺素再摄取抑制剂(SNRI)抗抑郁药相比,具有更卓越的抗抑郁疗效,能使抑郁症患者严重紊乱的生物节律重新恢复正常,且在重度抑郁症患者中,阿戈美拉汀的抗抑郁疗效优于SSRI类的氟西汀。大量的临床研究证实,阿戈美拉汀治疗抑郁症疗效好、起效快、同时改善伴随的焦虑症状;能够改善睡眠,对白天的警觉性无影响;安全性及耐受性好,尤其是对性功能的影响小,较以往抗抑郁药更具优势。其化学结构式如下: 
Figure BSA00000387690100011
专利EP0447285中报道了一种合成阿戈美拉汀的方法,以7-甲氧基-1-四氢萘酮为起始原料,与溴乙酸乙酯经Reformatsky反应制得(7-甲氧基-1-萘基)乙酸乙酯,再经水解、酰氯化、氨化、脱水消除、还原制得2-(7-甲氧基-1-萘基)乙胺,最后乙酰化得到阿戈美拉汀,如下式: 
Figure BSA00000387690100021
在转化为工业规模时,发现此方法难以实施,主要因为第一步的再现性,溴乙酸乙酯按照Reformatsky反应与7-甲氧基-1-四氢萘酮作用,产生(7-甲氧基-3,4-二氢-1(2H)-萘撑基乙酸乙酯,需要苯作溶剂,从环境方面考虑,不符合工业化生产要求。此外,(7-甲氧基-3,4-二氢-1(2H)-萘撑基乙酸乙酯的芳构化后续步骤常常是不完全的,并且皂化后得到的产品难以纯化。此路线反应步骤过长,平均收率小于30%, 
CN1680284提供了一种合成阿戈美拉汀的新方法,此方法共四个反应步骤,如下式: 
Figure BSA00000387690100022
该方法通过氰基乙酸与7-甲氧基-1-四氢萘酮在催化量庚酸苄基铵存在下直接缩合得到(7-甲氧基-3,4-二氢-1-萘基)乙腈,再经过芳构化、氨化和乙酰化得到阿戈美拉汀。显然,(7-甲氧基-3,4-二氢-1-萘基)乙腈是一种满足直接由7-甲氧基-1-四氢萘酮进行合成这一需要的理想的中间体,并且是芳构化步骤中优良的底物。但是庚酸苄基铵在工业生产中从成本及应用角度考虑不够理想。 
Organic Syntheses,Vol.31,p.25(1951)描述了用醋酸铵催化环己酮和氰基乙酸生成 [2-(1-环己烯基)]乙腈的反应,此反应分为两步,第一步在醋酸铵作用下生成亚异丙炔腈酸环己酯,然后在高温高压下发生脱羧反应得到[2-(1-环己烯基)]乙腈,但是反应收率很低,总收率在49%-69%之间。 
基于阿戈美拉汀的药用价值、良好的市场前景以及(7-甲氧基-3,4-二氢-1-萘基)乙腈作为其中间体在工业中的重要应用,找到更加经济有效的方法对(7-甲氧基-3,4-二氢-1-萘基)乙腈的合成进行优化是相当必要的。发明内容 
本发明的目的在于提供一种经济的、适合大规模生产的阿戈美拉汀中间体(7-甲氧基-3,4-二氢-1-萘基)乙腈的方法。 
一种工业合成式(Ⅰ)化合物的方法: 
Figure BSA00000387690100031
其特征在于氰基乙酸(B)与7-甲氧基-1-四氢萘酮(A)在含有催化量醋酸铵和哌啶中进行。在Organic Syntheses,Vol.31,p.25(1951)中描述了单独用醋酸铵催化的类似反应,本发明人发现当醋酸铵与哌啶配合使用时,能使反应收率得到很大的提高,克服了参考文献中的缺点,获得了意想不到的效果,反应产率可达91%。 
所述反应中氰基乙酸(B)的用量为7-甲氧基-1-四氢萘酮(A)用量的1-5倍,2倍为最佳。 
式(Ⅰ)化合物的制备方法中,醋酸铵的用量为7-甲氧基-1-四氢萘酮(A)的0.5-5倍,优选2倍,哌啶的用量为7-甲氧基-1-四氢萘酮(A)的5%-100%,优选20%。 
本发明进一步提供式(Ⅰ)化合物的制备方法,所用有机溶剂为苯,甲苯,二甲苯等,优选甲苯。 
本发明进一步提供式(Ⅰ)化合物的制备方法,采用氢氧化钠溶液、水以及饱和食盐水洗涤。 
本发明提供的进一步具体反应是:将7-甲氧基-1-四氢萘酮、氰基乙酸、醋酸铵和哌啶在甲苯中回流反应,待反应结束后冷却至室温;依次用氢氧化钠、水和饱和食盐水洗涤,无 水硫酸镁干燥;过滤,蒸干。具体实施方式 
实施例1 
176克7-甲氧基-1-四氢萘酮、170克氰乙酸和156克乙酸铵加入1L甲苯中,回流分水。TLC跟踪反应,直到7-甲氧基-1-四氢萘酮消失。冷却至室温,依次用2mol/L氢氧化钠溶液、水以及饱和食盐水洗涤,无水硫酸镁干燥,过滤,蒸干溶剂,得(7-甲氧基-3,4-二氢-1-萘基)乙腈46克,产率23%,熔点:48-49℃。 
实施例2 
176克7-甲氧基-1-四氢萘酮、170克氰乙酸、156克乙酸铵和17克哌啶加入1L甲苯中,回流分水。TLC跟踪反应,直到7-甲氧基-1-四氢萘酮消失。冷却至室温,依次用2mol/L氢氧化钠溶液、水以及饱和食盐水洗涤,无水硫酸镁干燥,过滤,蒸干溶剂,得(7-甲氧基-3,4-二氢-1-萘基)乙腈179克,产率90%,熔点:48-49℃。 
实施例3 
176克7-甲氧基-1-四氢萘酮、85克氰乙酸、38.5克乙酸铵和4.25克哌啶加入600ml甲苯中,回流分水。TLC跟踪反应,直到7-甲氧基-1-四氢萘酮消失。冷却至室温,依次用2mol/L氢氧化钠溶液、水以及饱和食盐水洗涤,无水硫酸镁干燥,过滤,蒸干溶剂,得(7-甲氧基-3,4-二氢-1-萘基)乙腈135克,产率68%。 
实施例4 
176克7-甲氧基-1-四氢萘酮、425克氰乙酸、385克乙酸铵和85克哌啶加入1.5L甲苯中,回流分水。TLC跟踪反应,直到7-甲氧基-1-四氢萘酮消失。冷却至室温,依次用2mol/L氢氧化钠溶液、水以及饱和食盐水洗涤,无水硫酸镁干燥,过滤,蒸干溶剂,得(7-甲氧基-3,4-二氢-1-萘基)乙腈181克,产率91%。 
各实施例对比 
Figure BSA00000387690100051
以上实施例仅用于进一步解释本发明,不用于也不应被理解为对权利要求中发明的限制。 

Claims (2)

1.一种工业合成式I化合物的方法:
Figure FSB0000118488800000011
其特征在于氰基乙酸与7-甲氧基-1-四氢萘酮在含有催化量的醋酸铵和哌啶中进行,其中,氰基乙酸的用量为7-甲氧基-1-四氢萘酮用量的2倍,醋酸铵的用量为7-甲氧基-1-四氢萘酮的2倍,哌啶的用量为7-甲氧基-1-四氢萘酮的20%。
2.权利要求1所述的方法,其特征在于所用有机溶剂为苯,甲苯,二甲苯。
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Citations (3)

* Cited by examiner, † Cited by third party
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CN1680296A (zh) * 2004-02-13 2005-10-12 瑟维尔实验室 (7-甲氧基-1-萘基)乙腈的新合成方法,及其在阿戈美拉汀的合成中的应用
CN1680295A (zh) * 2004-02-13 2005-10-12 瑟维尔实验室 (7-甲氧基-2-二氢-1-萘基)乙腈的新合成方法,及其在阿戈美拉汀的合成中的应用
CN101723855A (zh) * 2009-12-03 2010-06-09 浙江科技学院 一种(7-甲氧基-1-萘基)乙腈的合成方法

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US7498465B2 (en) * 2004-02-13 2009-03-03 Les Laboratoires Servier Process for the synthesis and crystalline form of agomelatine

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CN1680296A (zh) * 2004-02-13 2005-10-12 瑟维尔实验室 (7-甲氧基-1-萘基)乙腈的新合成方法,及其在阿戈美拉汀的合成中的应用
CN1680295A (zh) * 2004-02-13 2005-10-12 瑟维尔实验室 (7-甲氧基-2-二氢-1-萘基)乙腈的新合成方法,及其在阿戈美拉汀的合成中的应用
CN101723855A (zh) * 2009-12-03 2010-06-09 浙江科技学院 一种(7-甲氧基-1-萘基)乙腈的合成方法

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