Fully Substituted Conjugate Benzofuran Core: Multiyne Cascade Coupling and Oxidation of Cyclopropenone
作者:Liangliang Yao、Qiong Hu、Li Bao、Wenjing Zhu、Yimin Hu
DOI:10.1021/acs.orglett.1c01304
日期:2021.7.2
multiyne cascade coupling has been developed. This chemistry provides a novel, simple, and efficient approach to synthesize fullysubstituted conjugate benzofuran derivatives from simple substrates under mild conditions. The density functional theory (DFT) calculations reveal that the unique homolytic cleavages of cyclopropenone and molecular oxygen are crucial to the success of this reaction.
Access to Benzoxazepines and Fully Substituted Indoles via HDDA Coupling
作者:Xiaojie Zheng、Baohua Liu、Feihu Yang、Qiong Hu、Liangliang Yao、Yimin Hu
DOI:10.1021/acs.orglett.9b04499
日期:2020.2.7
The HDDA-derived benzyne intermediate was captured by oxazolines based on the addition reaction of benzyne to the C═N double bond. Benzoxazepine derivatives, fused benzoxazepine derivatives, and fully substituted indoles are synthesized in one step. The reaction does not require any catalyst or additives. Possible reaction mechanisms are presented.
Phenanthrenes/dihydrophenanthrenes: the selectivity controlled by different benzynes and allenes
作者:Liangliang Yao、Bo Fang、Qiong Hu、Yu Lei、Li Bao、Yimin Hu
DOI:10.1039/d0cc06300b
日期:——
A method for the intermolecular annulation of benzynes with allenes is disclosed. This protocol utilized allenes as an unconventional diene component for the selective synthesis of phenanthrenes and dihydrophenanthrenes under the control of different benzyne precursors, featuring high atom-economy and good functional group compatibility. Density functional theory (DFT) calculations reveal that different
A capture reaction of hexadehydro-Diels–Alder (HDDA) derived benzyne with various substituted oxazoles is reported. With methyl, hydrogen, or phenyl as the substituent at 2-position of oxazole, tetraynes afforded epoxyanthracene derivatives or underwent dicarbonylation on benzene ring. The reaction does not require any catalyst or additive. The mechanism behind the reaction was investigated. The obtained