在Pd(OAc)存在的情况下,将2,2'-联噻吩和3,3'-dicyano-2,2'-联噻吩在5-和5'-位置直接与芳基溴进行二芳基化,并伴随CH键断裂2和使用Cs 2 CO 3为碱的庞大的膦配体。在以(2,2'-联噻吩-5-基)二苯基甲醇为底物的反应中,通过CC键裂解在5-位发生的单芳基化反应选择性产生了5-芳基-2,2'-联噻吩和随后的用不同的芳基溴进行芳基化得到相应的不对称的5,5'-二芳基化产物。
Palladium‐Catalysed Direct Monoarylation of Bithiophenyl Derivatives or Bis(thiophen‐2‐yl)methanone with Aryl Bromides
作者:Karima Si Larbi、Safia Djebbar、Henri Doucet
DOI:10.1002/ejic.201100294
日期:2011.8
Arylated bithiophenes, which are useful compounds due to their coordination and/or physical properties, can be easily prepared by palladium-catalysed C–H bond activation of heteroaromatics followed by arylation using electron-deficient aryl bromides. A variety of 5-arylated 2,2′-bithiophenyl derivatives have been prepared. Good yields were generally obtained by using the air-stable [PdCl(dppb)(C3H5)]