Studies on the reactivity of 3-methyl-4-nitro-5-styrylisoxazoles with S-nucleophiles
摘要:
We have investigated the reactivity of 3-methyl-4-nitro-5-styrylisoxazoles with S-nucleophiles. This study revealed that the title compounds were optimal Michael acceptors toward thiols. A procedure was also established to prepare isoxazole-containing sulfides in one-pot and without the use of chromatography. Isoxazole-containing sulfides were converted into the corresponding sulfones in high yield. (C) 2011 Elsevier Ltd. All rights reserved.
Chiral Cyclopropenimine‐catalyzed Asymmetric Michael Addition of Bulky Glycine Imine to α,β‐Unsaturated Isoxazoles
作者:Yu‐Jun Bai、Mei‐Ling Cheng、Xiao‐Hui Zheng、Sheng‐Yong Zhang、Ping‐An Wang
DOI:10.1002/asia.202200131
日期:2022.6
A highly efficient asymmetric Michaeladdition of bulky glycine imine to α,β-unsaturated isoxazoles has been achieved by using 5 mol% of chiral cyclopropenimine (CSB-1) as a chiral organosuperbase catalyst under mild conditions to provide Michael adducts in excellent yields and stereoselectivities.