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.
Access to 1<i>a</i>,6<i>b</i>-Dihydro-1<i>H</i>-benzofuro[2,3-<i>b</i>]azirines and Benzofuran-2-amines via Visible Light Triggered Decomposition of α-Azidochalcones
A novel, efficient, organic process that involves a photocatalyst-free visiblelight triggered decomposition of α-azidochalcones, followed by intramolecular cyclization, 1,2-acyl migration, and isomerization to construct benzofuran based molecular architectures, is described. The scope and limitation of the synthetic strategy were studied by synthesizing over 30 structurally diverse benzofurans in