Based upon a twofold bromine-lithium exchange with 2,5-dibromo thiophene and sequential trapping of the dilithio intermediate, organo zinc halides were generated in situ and subsequently transformed by Negishi cross-coupling to unsymmetrically substituted thiophenes in a one-pot fashion. Application of this novel sequence to diiodo(hetero)arenes quickly furnishes highly interesting building blocks for materials science applications.
Palladium-catalysed direct arylation of thiophenes tolerant to silyl groups
作者:Lu Chen、Julien Roger、Christian Bruneau、Pierre H. Dixneuf、Henri Doucet
DOI:10.1039/c0cc04302h
日期:——
The palladium catalysed 5-arylation of 2-(trimethylsilyl)thiophene with aryl bromides via C–H bond functionalisation allows the synthesis of arylated silylthiophenes in only one step.