Direct Bromination of Ethyl 5-Alkylthiophene-2-carboxylates
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