申请人:BASF Aktiengesellscahft
公开号:US05442073A1
公开(公告)日:1995-08-15
A process for preparing alkyl 2-alkyl-4-fluoromethylthiazolecarboxylates of the formula I ##STR1## where R.sup.1 is alkyl, R.sup.2 is difluoromethyl or trifluoromethyl and R.sup.3 is alkyl, by reacting thiocarboxamides of the formula II ##STR2## where R.sup.1 has the abovementioned meaning, with alkyl 2-chloro-4-fluoroacetoacetamides of the formula III ##STR3## where R.sup.2 and R.sup.3 have the abovementioned meanings, in an aprotic solvent at below 100.degree. C. and reacting with a dehydrating agent, in the presence of a base, at below 80.degree. C. is described.
本发明提供了一种制备式I的烷基2-烷基-4-氟甲基噻唑羧酸酯的方法,其中R1表示烷基,R2表示二氟甲基或三氟甲基,R3表示烷基,通过在无水溶剂中在低于100°C的条件下,将式II的硫代羧酰胺(其中R1具有上述含义)与式III的烷基2-氯-4-氟乙酰乙酰胺(其中R2和R3具有上述含义)反应,并在存在碱的情况下,在低于80°C的条件下与脱水剂反应。