申请人:Labaz
公开号:US04186137A1
公开(公告)日:1980-01-29
3-Thienyl-acetate derivatives of the general formula: ##STR1## wherein R.sub.1 represents an alkyl, a cycloalkyl or an aralkyl radical, R.sub.2 represents hydrogen or R.sub.1 and R.sub.2, when they are taken together to form a cyclic group with the carbon atom to which they are attached, represent a polymethylene radical having from 2 to 5 carbon atoms, are prepared from a mixture consituted by a compound of the formula: ##STR2## wherein R.sub.3 has the meaning given above and an organic halide of the formula: R.sub.4 X wherein X represents fluorine, chlorine, bromine or iodine and R.sub.4 represents an alkyl, cycloalkyl or aralkyl radical or --CH.sub.2 (CH.sub.2).sub.n X in which n is an integer in the range of from 1 to 4 inclusive and X has the meaning given above, which mixture is added to an alkali metal hydride in dimethylformamide, at a temperature between -20.degree. C. and -5.degree. C., and allowed to react, in one step, at a temperature between -20.degree. C. and -5.degree. C. The 3-thienyl-acetate derivatives of formula I are useful as intermediate products for preparing pharmacologically active compounds.
通用公式为3-噻吩基乙酸酯衍生物:其中R.sub.1代表烷基、环烷基或芳基烷基基团,R.sub.2代表氢或R.sub.1和R.sub.2,当它们一起形成与它们附着的碳原子形成环状基团时,代表具有2至5个碳原子的聚甲烷基基团,从下述公式的化合物和具有上述给定含义的有机卤化物的混合物中制备:其中R.sub.3具有上述给定的含义,有机卤化物的公式为:R.sub.4 X,其中X代表氟、氯、溴或碘,R.sub.4代表烷基、环烷基或芳基烷基或--CH.sub.2 (CH.sub.2).sub.n X,其中n是从1到4的整数范围内的整数,X具有上述给定的含义,将该混合物加入二甲基甲酰胺中的碱金属氢化物,在温度在-20°C和-5°C之间,允许在-20°C和-5°C之间的温度下反应一步。公式I的3-噻吩基乙酸酯衍生物可用作制备药理活性化合物的中间体。