Convenient synthesis of hexasubstituted benzene derivatives via DABCO promoted domino reaction of arylidene malononitrile and dialkyl but-2-ynedioate
作者:Hui Zheng、Ying Han、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.cclet.2020.12.024
日期:2021.5
A convenient synthetic protocol for the hexasubstituted benzene derivatives was successfully developed by DABCO promoted domino reaction of arylidene malononitrile with two molecules of dialkyl but-2-ynedioates. The domino reaction resulted in tetraalkyl 6-cyano-[1,1′-biphenyl]-2,3,4,5-tetracarboxylates in good to high yields. This formal [2 + 2 + 2] cycloaddition was believed to proceed with sequential
DABCO促进了亚芳基丙二腈与两个丁二酸二烷基酯分子的多米诺反应,成功开发了一种方便的六取代苯衍生物合成方案。多米诺反应产生高至高收率的6-氰基-[1,1'-联苯] -2,3,4,5-四羧酸四烷基酯。据信这种正式的[2 + 2 + 2]环加成反应是依次进行亲核加成,迈克尔加成,环化和芳构化过程。