New synthetic approach to [1]benzopyrano[4,3-b]pyridin-5-one derivatives
作者:Egle M. Beccalli、Alessandro Contini、Pasqualina Trimarco
DOI:10.1016/j.tetlet.2004.03.009
日期:2004.4
A new synthesis of [1]benzopyrano[4,3-b]pyridin-5-ones 4 was developed starting from 3-formyl-coumarin N-functionalized amidines 3. The reaction is based likely on the intramolecular cyclocondensation of the C-α amidinic carbanion in basic medium on the formyl group.
从3-甲酰基香豆素N-官能化am 3开始,开发了[1]苯并吡喃并[4,3 - b ]吡啶-5-酮4的新合成方法。该反应很可能是基于在甲酰基的碱性介质中C-α氨基碳负离子的分子内环缩合。