Process for producing cis-(+,-)-3,4-dihydro-N,N,2-trimethyl-2H-1-benzopyran-3-amine, intermediates produced thereby and their preparation
申请人:WARNER-LAMBERT COMPANY
公开号:EP0027835A1
公开(公告)日:1981-05-06
A process for the preparation of cis-(±)-3.4-dihydro-N,N,2-trimethyl-2H-1-benzopyran-3-amine (I), a known anti-depressant, is disclosed. The process of the invention is a multi-step process starting with 2-methyl-2H-1-benzopyran (II), which involves the production of the novel intermediates (2 alpha, 3 beta, 4 alpha)-(±)-3,4-dihydro-2-methyl-4-(methylamino)-2H-1-benzopyran-3-ol (IV) and its hydrogen sulphate ester (V), as well as (1a alpha, 2 beta, 7b alpha)-(±)-1,1a,2,7b-tetrahydro-1,2-dimethyl-[1]benzopyrano-[3,4-b]azirine (VI) and cis-(±)-3,4-di- hydro-N,2-dimethyl-2H-1-benzopyran-3-amine (VII). In the final step of the process, the novel compound VII is methylated to form the desired compound I. The process is less expensive, less hazardous and less difficult than known ways of producing compound I.
Compounds IV and V have the formula:
where X is -OH and -OS03H respectively. Compound VI has the formula:
Compound VII has the formula:
本发明公开了一种制备顺式-(±)-3.4-二氢-N,N,2-三甲基-2H-1-苯并吡喃-3-胺(I)的工艺,这是一种已知的抗抑郁剂。本发明的工艺是一个从 2-甲基-2H-1-苯并吡喃 (II) 开始的多步骤工艺,包括生产新型中间体 (2 alpha, 3 beta, 4 alpha)-(±)-3.4- 二氢-N,N,2-三甲基-2H-1-苯并吡喃-3-胺 (I)、4-二氢-2-甲基-4-(甲基氨基)-2H-1-苯并吡喃-3-醇 (IV) 及其硫酸氢酯 (V),以及 (1a alpha, 2 beta, 7b alpha)-(±)-1、1a,2,7b-四氢-1,2-二甲基-[1]苯并吡喃-[3,4-b]氮丙啶(VI)和顺式-(±)-3,4-二氢-N,2-二甲基-2H-1-苯并吡喃-3-胺(VII)。在该工艺的最后一步,新型化合物 VII 被甲基化,形成所需的化合物 I。与已知的生产化合物 I 的方法相比,该工艺成本更低、危害更小、难度更低。
化合物 IV 和 V 的化学式如下
其中 X 分别为-OH 和-OS03H。化合物 VI 的化学式为
化合物 VII 的化学式为