Regioselective C-2 or C-5 Direct Arylation of Pyrroles with Aryl Bromides using a Ligand-Free Palladium Catalyst
作者:Julien Roger、Henri Doucet
DOI:10.1002/adsc.200900196
日期:——
acetyl or ester at the C-2 position of the pyrrole is tolerated. This environmentally attractive procedure has also been found to be tolerant to a very wide variety of functional groups on the aryl bromides such as formyl, acetyl, propionyl, ester, nitrile, nitro, fluoro, methoxy, amino or trifluoromethyl.
据报道,通过CH键活化,吡咯的区域选择性C-2或C-5芳基化的简单且经济的方法。仅使用0.5-0.01 mol%的市售且无空气稳定的无配体的乙酸钯(II)[Pd(OAc)2 ]作为催化剂。容许在吡咯的C-2位置存在吸电子取代基,例如甲酰基,乙酰基或酯。还已经发现这种对环境有吸引力的方法可耐受芳基溴化物上的各种官能团,例如甲酰基,乙酰基,丙酰基,酯,腈,硝基,氟,甲氧基,氨基或三氟甲基。