Selective Mono- to Perarylations of Tetrabromothiophene by a Cyclobutene-1,2-diylbisimidazolium Preligand
作者:Alireza Rahimi、Jan C. Namyslo、Martin H. H. Drafz、Julian Halm、Eike Hübner、Martin Nieger、Nicola Rautzenberg、Andreas Schmidt
DOI:10.1021/jo201317t
日期:2011.9.16
m)tetrafluoroborate is applied as preligand in palladium-catalyzedcross-couplingreactions starting from tetrabromothiophene for the synthesis of mono-, bi-, tri-, and tetraaryl-substituted thiophenes bearing up to four different aryl rings. A synthetic kit for preparations of nine different substitution patterns of arylated thiophenes is presented by application of only one single catalyst system