Palladium-Catalyzed C2 or C5 Direct Arylation of 3-Formylthiophene Derivatives with Aryl Bromides
作者:Jia Jia Dong、Henri Doucet
DOI:10.1002/ejoc.200901213
日期:2010.2
The system Pd(OAc) 2 /dppb was found to be an efficient catalyst precursor for the directarylation of 3-formylthiophenederivatives. When using 3-formylthiophene, the 2-arylated thiophenes were obtained with regioselectivities of 76―86 %, whereas the arylation of 3-formylthiophene diethyl acetal gave the 5-arylated thiophenes with regioselectivities of 64― 88 %. These reactions were performed by using