A facile and practical preparation of 5,7-dihydroxy-3-(4-nitrophenyl)-4<i>H</i>-1-benzopyran-4-one
作者:D. F. Liu、C. C. Cheng
DOI:10.1002/jhet.5570280632
日期:1991.10
methods for the synthesis of hydroxylated isoflavones were reported during the past fifty years, none is suitable for the preparation of isoflavones containing 5,7-dihydroxyl functions. This paper reports a simple, large scale preparation of 5,7-dihydroxy-3-(4-nitrophenyl)-4H-1-benzopyran-4-one (2a) by the condensation of the readily available 4-nitrobenzyl 2,4,6-trihydroxyphenyl ketone (1a) and acetic-formic
尽管在过去的五十年中已经报道了几种合成方法来合成羟基化的异黄酮,但没有一种方法适合于制备具有5,7-二羟基官能团的异黄酮。本文报告了一种简单的大规模制备5,7-二羟基-3-(4-硝基苯基)-4 H -1-苯并吡喃-4-酮(2a)的方法,该方法是通过将现成的4-硝基苄基2,4缩合1,6-三羟苯基酮(1a)和乙甲酸酐的收率很高。类似异黄酮,如7-羟基-3-(4-硝基苯基)-4- ħ -1-苯并吡喃-4-酮(2B)也可在类似的方式良好的产率获得。