One-pot synthesis of 2-substituted benzo[b]furans via Pd–tetraphosphine catalyzed coupling of 2-halophenols with alkynes
作者:Rong Zhou、Wei Wang、Zhi-jie Jiang、Kun Wang、Xue-li Zheng、Hai-yan Fu、Hua Chen、Rui-xiang Li
DOI:10.1039/c4cc00815d
日期:——
A catalyst composed of [Pd(η(3)-C3H5)Cl]2 and N,N,N',N'-tetra(diphenylphosphinomethyl)pyridine-2,6-diamine (L) was found to be effective for one-pot synthesis of 2-substituted benzo[b]furans from 2-halophenols and alkynes. For 2-bromo-3-hydroxypyridine, the catalyst loading could be as low as 1 ppm and the turnover number (TON) was up to 870,000.
发现由[Pd(η(3)-C3H5)Cl] 2和N,N,N',N'-四(二苯基膦基甲基)吡啶-2,6-二胺(L)组成的催化剂对由2-卤代酚和炔烃锅内合成2-取代的苯并[b]呋喃。对于2-溴-3-羟基吡啶,催化剂负载量可低至1 ppm,周转数(TON)高达870,000。