Enantioselective Synthesis of Chromanones through Organocatalytic Tandem Reactions
作者:Mengxue Lu、Xin Wang、Zongli Xiong、Jingxiang Duan、Wen Ren、Weijun Yao、Yi Xia、Zhen Wang
DOI:10.1002/adsc.202001031
日期:2020.12.8
An enantioselective approach to lactone‐fused chromanone derivatives from 1‐(2‐hydroxyaryl)‐1,3‐diketones and α,β‐unsaturated aldehydes under mild conditions has been developed, which included organocatalytic stepwise Michaeladdition/ cycloketalization/hemiacetalization and followed by oxidation reaction. In the presence of chiral amine organocatalyst and an additional salicylic acid, a wide range
Rapid Construction of Tricyclic Furanobenzodihydropyrans by Asymmetric Tandem Reaction
作者:Yulong Zhang、Jingxiang Duan、Yuqiao Zhou、Xiaoyi Li、Weijun Yao、Zhen Wang
DOI:10.1021/acs.joc.2c02228
日期:2023.2.3
A process based on the organocatalyzed Mannich/cycloketalization/transesterification tandemreaction of 1-(2-hydroxyaryl)-1,3-diketones and β,γ-alkynyl α-imino esters has been developed, delivering a variety of tricyclic furanobenzodihydropyrans with excellent results (up to 99% yield, 99% ee, and >19:1 dr).