Three-component couplingreactions of 2-(cyanomethyl)phenol, aryl halides, and carbon monoxide (CO) in orthogonal–tandem catalysis were investigated. In the reactions, 2-(cyanomethyl)phenyl esters, which are produced through Pd(PPh3)4-catalyzed alkoxycarbonylation of aryl halides with 2-(cyanomethyl)phenol, undergo cycloisomerization in situ catalyzed by Pd(PCy3)2 as a co-catalyst to give 3-acyl-2-aminobenzofurans
A new route to 3-acyl-2-aminobenzofurans: palladium-catalysed cycloisomerisation of 2-(cyanomethyl)phenyl esters
作者:Masahito Murai、Koji Miki、Kouichi Ohe
DOI:10.1039/b904127c
日期:——
Treatment of 2-(cyanomethyl)phenyl esters with a catalytic amount of Pd(OAc)(2), PCy(3), and Zn afforded 3-acyl-2-aminobenzofuran derivatives in good to excellent yields, which can be used as building blocks for the synthesis of benzofuran fused heterocycles.