Hetero Diels-Alder Reaction and Ene Reaction of Acylnitroso Species in situ Generated by Hypoiodite Catalysis
作者:Saki Uraoka、Ikumi Shinohara、Hisato Shimizu、Keiichi Noguchi、Akira Yoshimura、Viktor V. Zhdankin、Akio Saito
DOI:10.1002/ejoc.201801340
日期:2018.12.6
Firstexample of hypoiodite‐catalyzed oxidation for the in situ generation of acylnitroso species, which can be used in hetero Diels–Alder reactions with dienes and in enereactions with alkenes.
Diels-Alder (HDA) and enereactions. Methods: Acylnitroso intermediates were readily obtained by hydrogen peroxide oxidation of hydroxamic acids catalyzed by Cu(I)-, Ir(I)- or Ru(II)-complexes and easily reacted with symmetric and asymmetric conjugated dienes beside their reaction with different alkenes which converted to biological active products. Results: The resulted acylnitroso intermediates were efficiently
Highly reactive acylnitroso intermediates were formed in situ by transition metals-catalyzed hydrogen peroxide oxidation of hydroxamicacids 1a–b and these transient species trapped with alkenes 2a–c to afford the corresponding ene products 3a–d and 4b up to 91% yield, and halocyclization of 3d gave substituted oxazolidinone 5a in 77% yield.