Programmed Site-Selective Palladium-Catalyzed Arylation of Thieno[3,2<i>-b</i>
]thiophene
作者:T. M. Ha Vuong、Didier Villemin、Hung-Huy Nguyen、Tin Thanh Le、Tung T. Dang、Hien Nguyen
DOI:10.1002/asia.201700562
日期:2017.11.2
2‐b]thiophenes were synthesized by direct site‐selective Pd‐catalyzed C−H activation reactions with various aryl bromides in the presence of a phosphine‐free Pd(OAc)2/KOAc catalyst system in N,N‐dimethylacetamide (DMAc). The arylation of 2‐arylthieno[3,2‐b]thiophene took place at the C3 position if the 2‐aryl substituents possessed electron‐withdrawing groups and at the C5 position if they were bulky and
单,二,三和四芳基噻吩并[3,2- b ]噻吩是在无膦的Pd(OAc)存在下,通过直接位点选择性Pd催化的CH活化反应与各种芳基溴化物合成的。 )2 / KOAc在N,N-二甲基乙酰胺(DMAc)中的催化剂体系。如果2-芳基取代基具有吸电子基团,则芳基噻吩并[3,2 -b ]噻吩的芳基化反应将在C3位置发生;如果它们较大且具有给电子基团,则芳基化在C5位置。