Double bromine-lithium exchange and sequential trapping of the dilithio intermediate with different electrophiles gives rise to the formation of unsymmetrically substituted (hetero)arenes in a one-pot fashion.
双溴-锂交换和二锂中间体用不同亲电子试剂的顺序捕获导致以一锅方式形成不对称取代的(杂)芳烃。
Dual Electrophilic Trapping-Negishi Coupling with Dilithiothiophenes in a Three-Component, One-Pot Process
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.