A process for the preparation of a substituted thiazole comprises reacting an isothiocyanate compound of the general formula Hal.CH(R.sub.1). CH.dbd.C(R.sub.2).NCS in which Hal is a chlorine or bromine atom and R.sub.1 and R.sub.2 is each a hydrogen atom or an alkyl group containing 1 to 3 carbon atoms, in solution with a chlorinating or brominating agent. The compound 2-chloro-5-(chloromethyl) thiazole, which is an important intermediate in the manufacture of agrochemical and pharmaceutical products, may very advantageously be prepared by this method.
一种制备取代
噻唑的方法,包括将一般式为Hal.CH(R.sub.1). CH.dbd.C(R.sub.2).
NCS的异
硫氰酸酯化合物与
氯化或
溴化试剂在溶液中反应。其中,Hal是
氯或
溴原子,R.sub.1和R.sub.2分别是一个氢原子或含1至3个碳原子的烷基。这种方法非常适用于制备制造农药和药物产品的重要中间体2-
氯-5-(
氯甲基)
噻唑。