intermediates 2 under acidic conditions yielded 2,2,2-trichloroethylideneacetophenones 3, which were transformed to 2,2-dichlorovinylacetophenones 5 in nearly quantitative yields by selective electrochemical monodechlorination at either mercury or graphite electrodes. Finally, 3-aryl-5-dichloromethyl-2-pyrazolines 7 were efficiently obtained on treatment of compounds 5 with either hydrazine or methylhydrazine
已经建立了标题化合物的有效合成途径。Chloralacetophenones 2被治疗的
苯乙酮的制备1用无
水三氯乙醛。中间体的脱
水2的酸性条件下得到2,2,2- trichloroethylideneacetophenones 3,将其转化为2,2- dichlorovinylacetophenones 5中任一处或
汞石墨电极几乎定量的产率通过选择性电
化学monodechlorination。最后,用
肼或甲基
肼处理化合物5可有效地获得3-芳基-5-二
氯甲基-2-
吡唑啉7。