作者:A. V. Samet、D. N. Lutov、S. I. Firgang、Yu. V. Nelyubina、V. V. Semenov
DOI:10.1007/s11172-013-0318-4
日期:2013.10
Levoglucosenone, an optically active α,β-unsaturated ketone available from cellulose, undergoes a stereoselective oxa-Michael-aldol domino reaction with 2-hydroxybenzaldehydes with the formation of optically active oxepino[4,5-b]chromen-1-ones. These compounds attacked by nucleophiles undergo recyclization to 4-substituted oxepino[3,4-b]chromen-11a-ols, while their oximes treated with SOCl2 are converted to 3-cyano-2H-chromenes
Levoglucosenone 是一种可从纤维素获得的光学活性 α,β-不饱和酮,它与 2-羟基苯甲醛发生立体选择性 oxa-Michael-aldol 多米诺反应,形成光学活性 oxepino[4,5-b]chromen-1-ones。这些被亲核试剂攻击的化合物会再环化为 4-取代的氧杂[3,4-b]色烯-11a-醇,而它们用 SOCl2 处理的肟通过贝克曼断裂转化为 3-氰基-2H-色烯。