A simple and practical method for α-ketoamide synthesis via a decarboxylative strategy of isocyanates with α-oxocarboxylic acids is described. The reaction proceeds at room temperature under mild conditions without an oxidant or an additive, showing good substrate scope and functional compatibility. Moreover, the applicability of this method was further demonstrated by the synthesis of various bioactive
Highly regioselective synthesis of lactams <i>via</i> cascade reaction of α,β-unsaturated ketones, ketoamides, and DBU as a catalyst
作者:Xin Qin、Jinhai Zhang、Zhan-Yong Wang、Yimei Song、Yixiao Yang、Wenhai Zhang、Hongxin Liu
DOI:10.1039/d2ra07117g
日期:——
Herein, the aldol/Michael cascade reaction on the β,γ-positions of α,β-unsaturatedketones with ketoamides to construct bicyclic lactams via DBU catalysis has been developed. The substrates were well-tolerated with high regio- and diastereoselectivities in moderate to good yields (32 examples). The control experiments revealed that the hydrogen of the amide was the key factor.
An efficient iodine-mediatedoxidation reaction for ynamides has been developed to produce N-monosubstituted α-ketoamides and α-ketoimides. This oxidative method, which exhibits good functional group tolerance, was performed under mild conditions without a metal catalyst.
Switchable multipath cascade cyclization to synthesize bicyclic lactams and succinimides <i>via</i> chemodivergent reaction
作者:Yimei Song、Chaofei Wu、Jinhai Zhang、Wenhai Zhang、Xin Qin、Yixiao Yang、Guowei Kang、Jun Jiang、Hongxin Liu
DOI:10.1039/d2cc06841a
日期:——
Herein, a novel switchable multipath cascade cyclizationvia chemodivergent reaction between readily available ketoamides and deconjugated butenolides was developed to efficiently synthesize γ-lactone fused γ-lactams and succinimide fused hemiketals. The Aldol/aza-Michael reaction and Aldol/imidation/hemiketalization reaction were enabled by catalytic amounts of two bases, namely tetramethyl guanidine