An Efficient, One-Pot Regioselective Synthesis of Highly Functionalized Chromen-5-ones and Pyrano[3,2-c]chromen-5-ones via a Tandem Knoevenagel–Michael–Cyclization Sequence
作者:Paramasivan Perumal、Jayabal Kamalraja、Doraiswamy Muralidharan
DOI:10.1055/s-0032-1317543
日期:——
facile, convenient, efficient, and high-yielding regioselective synthesis of a combinatorial library of hitherto unreported highly functionalized chromen-5-ones and pyrano[3,2-c]chromen-5-ones has been developed by one-pot three-component coupling of substituted aromatic aldehydes, dimedone/4-hydroxycoumarin with NMSM in the presence of catalytic amount of piperidine in ethanol medium. This transformation
迄今为止未报道的高度官能化的 chromen-5-ones 和 pyrano[3,2-c]chromen-5-ones 的组合库的简便、方便、高效和高产的区域选择性合成已由一锅三-在乙醇介质中催化量的哌啶存在下,取代的芳香醛、二甲酮/4-羟基香豆素与NMSM的组分偶联。这种转变大概是通过多米诺骨牌 Knoevenagel 缩合-迈克尔加成-分子间环化序列进行的,在一次操作中产生三个新键(两个 C-C 和一个 C-O)和一个立体中心。