5-(2-Chloroalkyl)-4-methylthiazoles, their preparation and their use, and intermediates for their preparation
申请人:Astra Aktiebolag
公开号:EP0546306A1
公开(公告)日:1993-06-16
The invention relates to 5-(2-chloro-C2-5-alkyl)-4-methyl-1,3-thiazoles of the general formula I,
wherein R is a straight-chain 2-chloro-C2-5-alkyl group
and a process for their preparation, which is characterized by
(A1) reacting a 3-(2-chloro-C2-5-alkyl)-3-thiocyanato-2-propanone of the general formula IV
in an organic solvent with gaseous hydrogen chloride to obtain the corresponding 2-chloro-5-(2-chloro-C2-5- alkyl)-4-methyl-1,3-thiazole of the general formula II
or
(A2) reacting a 3-(2-chloro-C2-5-alkyl)-3-thiocyanato-2-propanone of the above formula IV with an aqueous mineral acid to obtain the corresponding 5-(2-chloro-C2-5-alkyl)-2-hydroxy-4-methyl-1,3-thiazole of the general formula III
and reacting the thus obtained compound of the formula III with a halogenating agent to obtain the corresponding 2-chloro-5-(2-chloro-C2-5-alkyl)-4-methyl-1,3-thiazole of the above formula II,
and
(B) hydrogenating the compound of the general formula II to obtain the 5-(2-chloro-C2-5-alkyl)-4-methyl-1,3-thiazole of the above general formula I.
The invention further relates to intermediates for the above process, and pharmaceutical compositions comprising the compounds of formula I.
本发明涉及通式 I 的 5-(2-氯-C2-5-烷基)-4-甲基-1,3-噻唑、
其中 R 为直链 2-氯-C2-5-烷基
及其制备工艺,其特征在于
(A1) 将通式 IV 的 3-(2-氯-C2-5-烷基)-3-硫氰基-2-丙酮反应
在有机溶剂中与气态氯化氢反应,得到相应的通式 II 的 2-氯-5-(2-氯-C2-5-烷基)-4-甲基-1,3-噻唑
或
(A2) 将上式 IV 的 3-(2-氯-C2-5-烷基)-3-硫氰基-2-丙酮与矿酸水溶液反应,得到相应的通式 III 的 5-(2-氯-C2-5-烷基)-2-羟基-4-甲基-1,3-噻唑
将由此得到的通式 III 的化合物与卤化剂反应,得到相应的通式 II 的 2-氯-5-(2-氯-C2-5-烷基)-4-甲基-1,3-噻唑、
和
(B) 将通式 II 的化合物氢化,得到上述通式 I 的 5-(2-氯-C2-5-烷基)-4-甲基-1,3-噻唑。
本发明进一步涉及上述工艺的中间体,以及包含式 I 化合物的药物组合物。