DBU-Induced Phenol-Keto Resonance in 3,5-Dihydroxyphthalide: Regioselectivities in Condensations with α,β-Unsaturated Aldehydes - Facile Synthesis of Bioactive Natural and Unnatural Benzopyrans
作者:Narshinha P. Argade、Mukulesh Mondal
DOI:10.1055/s-2004-825596
日期:——
Remarkably tuned regioselectivities are obtained in the condensation of 3,5-dihydroxyphthalide (1) with several α,β-unsaturated aldehydes using DBU and neutral conditions. The linear (65-81%) and angular (51-60%) bioactive natural and unnatural benzopyran derivatives are produced exclusively in one step and are described via phenol-keto resonance.
在使用 DBU 和中性条件下,3,5-二羟基邻苯二甲酸酯 (1) 与几种 α,β-不饱和醛的缩合得到显着调节的区域选择性。线性 (65-81%) 和角形 (51-60%) 生物活性天然和非天然苯并吡喃衍生物仅在一个步骤中生产,并通过苯酚-酮共振进行描述。