Palladium-catalyzed oxidative C–H/C–H cross-coupling of pyrazolo[1,5-<i>a</i>]azines with five-membered heteroarenes
作者:Thanh V. Q. Nguyen、Lorenzo Poli、Aaron T. Garrison
DOI:10.1039/d1cc06337e
日期:——
as the oxidant enabled the direct regioselective oxidative C–H/C–H cross-coupling of pyrazolo[1,5-a]pyrimidines or pyrazolo[1,5-a]pyridines with various five-membered heteroarenes without the need of pre-activation and/or directing groups. Successful coupling partners include thiophenes, benzothiophenes, thiazoles, furans, oxazoles, indoles and imidazo[1,2-a]pyridines.
使用 Pd(OAc) 2作为催化剂,AgOAc 作为氧化剂,使得吡唑并[1,5- a ]嘧啶或吡唑并[1,5 - a ]的直接区域选择性氧化C-H/C-H交叉偶联成为可能吡啶与各种五元杂芳烃,无需预活化和/或导向基团。成功的偶联伙伴包括噻吩、苯并噻吩、噻唑、呋喃、恶唑、吲哚和咪唑并[1,2- a ]吡啶。