Synthesis of 5,5′-diarylated 2,2′-bithiophenes via palladium-catalyzed arylation reactions
作者:Aya Yokooji、Tetsuya Satoh、Masahiro Miura、Masakatsu Nomura
DOI:10.1016/j.tet.2004.06.075
日期:2004.8
bromides at the 5- and 5′-positions accompanied by C–H bond cleavage in the presence of Pd(OAc)2 and a bulky phosphine ligand using Cs2CO3 as base. In the reaction using (2,2′-bithiophen-5-yl)diphenylmethanol as the substrate, monoarylation at the 5-position via C–C bond cleavage occurs selectively to give 5-aryl-2,2′-bithiophenes and the subsequent arylation with a different aryl bromide affords the
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。