A highly regio‐, diastereo‐ and enantioselectiveMichaeladdition–alkylationreaction between α‐substituted cyano ketones and (Z)‐bromonitrostyrenes has been realized by using a chiral N,N′‐dioxide as organocatalyst. A variety of substrates performed well in this reaction, and the corresponding multifunctionalized chiral 2,3‐dihydrofurans were obtained in up to 95 % yield with 95:5 dr and 93 % ee.
Mild and efficient synthesis of <i>trans</i>-3-aryl-2-nitro-2,3-dihydrobenzofurans on water
作者:Juhua Feng、Siyuan Wang、Jinxiang Feng、Qiuju Li、Junping Yue、Guizhou Yue、Ping Zou、Guangtu Wang
DOI:10.1039/d0nj00548g
日期:——
An environmental-friendly and mild method has been successfully developed for the synthesis of 3-aryl-2-nitro-2,3-dihydrobenzofurans through domino Friedel–Crafts/substitution reaction of (Z)-bromonitrostyrenes with sesamol. A variety of substrates performed well in this reaction, and the corresponding 3-aryl-2-nitro-2,3-dihydrobenzofurans were obtained in excellent yields (up to 99%). Significantly