作者:Ilya Taydakov、Sergey Krasnoselskiy
DOI:10.1055/s-0030-1258160
日期:2010.9
electrophilic bromination of the corresponding acids and esters were compared and investigated. A synthetic route was developed involving direct bromination of ethyl 5-alkylthiophene-2-carboxylates followed by saponification of the resulting ethyl 5-alkyl-4-bromothiophene-2-carboxylates. The key bromination step is selective in dichloromethane solution at 0-5 ˚C and furnishes the corresponding ethyl 5-alk
比较和研究了通过亲电子溴化相应的酸和酯来溴化噻吩-2-羧酸的方法。开发了一种合成路线,包括直接溴化5-烷基噻吩-2-羧酸乙酯的继而对所得的5-烷基-4-溴噻吩-2-羧酸乙酯进行皂化。关键的溴化步骤是在0-5°C的二氯甲烷溶液中选择性进行的,并以优异的收率得到相应的5-烷基-4-溴噻吩-2-羧酸乙酯。没有观察到烷基取代基的迁移或异构化。 溴-酯-噻吩-亲电子芳族取代-铝