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.
一种简明的方法已被开发用于基于纳米氰对原位生成的取代邻醌甲醚的迈克尔加成合成2-氨基-3-芳基-3H-苯并呋喃。通过酸水解可以直观地获得3-芳基-3H-苯并呋喃-2-酮,而N-Boc保护的2-氨基-3-芳基-3H-苯并呋喃则顺利发生分子内环化,生成1H-苯并呋喃[2,3-b]吡啶-2-酮衍生物。