Photoredox Catalysis Enables Decarboxylative Cyclization with Hypervalent Iodine(III) Reagents: Access to 2,5-Disubstituted 1,3,4-Oxadiazoles
作者:Jian Li、Xue-Chen Lu、Yue Xu、Jin-Xia Wen、Guo-Quan Hou、Li Liu
DOI:10.1021/acs.orglett.0c03663
日期:2020.12.18
A novel approach to 2,5-disubstituted 1,3,4-oxadiazoles derivatives via a decarboxylative cyclization reaction by photoredox catalysis between commercially available α-oxocarboxylic acids and hypervalent iodine(III) reagent is described. This powerful transformation involves the coupling reaction between two different kinds of radical species and the formation of C–N and C–O bonds.
<i>N</i>-Heterocyclic Carbene-Catalyzed Cyclization of Aldehydes with α-Diazo Iodonium Triflate: Facile Access to 2,5-Disubstituted 1,3,4-Oxadiazoles
作者:Hang Huang、Xianghua Zou、Si Cao、Zhihong Peng、Yingying Peng、Xi Wang
DOI:10.1021/acs.orglett.1c01128
日期:2021.6.4
novel organocatalytic process for synthesis of complex 1,3,4-oxadiazoles from readily accessible aldehydes. By exploiting the nucleophilicity of the putative Breslow intermediate and the inherent electrophilicity of α-diazo iodoniumtriflate, we have found that N-heterocyclic carbene catalyst promotes efficient cyclization of various aldehydes and α-diazo iodoniumtriflates. The reaction proceeds under