Copper-catalysed domino reaction of 2-bromobenzylidenemalonates and 1,3-dicarbonyls for the synthesis of chromenes
作者:Yotsakorn Saebang、Vatcharin Rukachaisirikul、Juthanat Kaeobamrung
DOI:10.1016/j.tetlet.2016.12.006
日期:2017.1
4H-Chromenes were synthesized from 2-bromobenzylidenemalonates and 1,3-dicarbonyls under mild and simple reaction conditions via copper-catalysed domino reactions involving Michael addition and intramolecular Ullmann-type C(aryl)–O bond formation. Although a competitive elimination affected these reactions, this catalytic system readily provided chromenes with functionality at the C-4 position.
4个ħ -Chromenes从2- bromobenzylidenemalonates和温和和简单的反应条件下1,3-二羰基合成通过涉及迈克尔加成铜催化反应多米诺和分子内的Ullmann型C(芳基)-O键的形成。尽管竞争性消除影响了这些反应,但是该催化体系很容易在C-4位置为色烯提供了功能。