申请人:Boehringer ingelheim Chemicals, Inc.
公开号:US20040002603A1
公开(公告)日:2004-01-01
A process for making nevirapine, comprising the following steps:
(a) reacting a 2-halo-3-pyridinecarbonitrile of the formula
1
wherein X is a fluorine, chlorine, bromine or iodine atom, preferably chlorine or bromine, with cyclopropylamine, to yield 2-(cyclopropylamino)-3-pyridinecarbonitrile;
(b) hydrolyzing the 2-(cyclopropylamino)-3-pyridinecarbonitrile to yield 2-(cyclopropylamino)-3-pyridine carboxylic acid;
(c) isolating the 2-(cyclopropylamino)-3-pyridine carboxylic acid from the reaction medium;
(e) treating the 2-(cyclopropylamino)-3-pyridine carboxylic acid with a chlorinating agent, to yield 2-(cyclopropylamino)-3-pyridinecarbonyl chloride;
(f) reacting the 2-(cyclopropylamino)-3-pyridine carbonyl chloride with a 2-halo-4-methyl-3-pyridinamine of the formula
2
wherein X is a fluorine, chlorine, bromine or iodine atom, preferably chlorine or bromine, to produce an N-(2-halo-4-methyl-3-pyridinyl)-2-(cyclopropylamino)-3-pyridinecarboxamide; and
(g) cyclizing the N-(2-halo-4-methyl-3-pyridinyl)-2-(cyclopropylamino)-3-pyridinecarboxamide by treatment with a strong base, to yield nevirapine.
一种制备奈韦拉平的方法,包括以下步骤:(a)将式1中X为氟、氯、溴或碘原子(优选氯或溴)的2-卤代-3-吡啶甲腈与环丙基胺反应,得到2-(环丙基氨基)-3-吡啶甲腈;(b)水解2-(环丙基氨基)-3-吡啶甲腈,得到2-(环丙基氨基)-3-吡啶羧酸;(c)从反应介质中分离出2-(环丙基氨基)-3-吡啶羧酸;(e)用氯化试剂处理2-(环丙基氨基)-3-吡啶羧酸,得到2-(环丙基氨基)-3-吡啶羰氯;(f)将2-(环丙基氨基)-3-吡啶羰氯与式2中X为氟、氯、溴或碘原子(优选氯或溴)的2-卤代-4-甲基-3-吡啶胺反应,得到N-(2-卤代-4-甲基-3-吡啶基)-2-(环丙基氨基)-3-吡啶羧酰胺;(g)通过强碱处理N-(2-卤代-4-甲基-3-吡啶基)-2-(环丙基氨基)-3-吡啶羧酰胺,环化得到奈韦拉平。