A Concise Route to 2-Amino-3-aryl-3H-benzofurans and their Use as Precursors to 3-Aryl-3H-benzofuran-2-one and 1H-Benzofuro[2,3-b]pyridin-2-one Derivatives
A Concise Route to 2-Amino-3-aryl-3<i>H</i>-benzofurans and their Use as Precursors to 3-Aryl-3<i>H</i>-benzofuran-2-one and 1<i>H</i>-Benzofuro[2,3-<i>b</i>]pyridin-2-one Derivatives
作者:Michèle Gerster、Reto Wicki
DOI:10.1055/s-2003-44389
日期:——
A concise approach to 2-amino-3-aryl-3H-benzofurans based on the Michael addition of NaCN onto in situ generated substituted o-quinone methides has been developed. Straightforward access to 3-aryl-3H-benzofuran-2-ones was achieved upon acidic hydrolysis whereas N-Boc-protected 2-amino-3-aryl-3H-benzofurans underwent smooth intramolecular cyclisation to give 1H-benzofuro[2,3-b]pyridin-2-one derivatives.