Synthesis of 2-alkyl-chroman-4-ones <i>via</i> cascade alkylation–dechlorination of 3-chlorochromones
作者:Shunyao Li、Lanfei Zhang、Qian He、Xiaofei Zhang、Chunhao Yang
DOI:10.1039/d1ob00463h
日期:——
An efficient and mild synthetic approach for 2-alkyl-substituted chroman-4-ones via zinc mediated cascade decarboxylative β-alkylation and dechlorination of 3-chlorochromones was developed.
Synthesis of Multisubstituted 2-Aminopyrroles/pyridines via Chemoselective Michael Addition/Intramolecular Cyclization Reaction
作者:Xueyu Qi、Haoyue Xiang、Qian He、Chunhao Yang
DOI:10.1021/ol5018855
日期:2014.8.15
A facile and efficient synthetic strategy to construct polysubstituted 2-aminopyrroles/pyridines was developed via chemoselective Michaeladdition/intramolecular cyclization reaction under very mild conditions. It suggested that the chemoselectivity of the process could be controlled by the leaving ability of the halides.
Regioselective synthesis of substituted thiazoles <i>via</i> cascade reactions from 3-chlorochromones and thioamides
作者:Tianzi Dai、Chen Cui、Xueyu Qi、Yanshu Cheng、Qian He、Xiaofei Zhang、Xiaomin Luo、Chunhao Yang
DOI:10.1039/d0ob01019g
日期:——
substituted thiazoles via a cascade reaction from chromone derivatives and thioamides in an environmentally benign medium was developed. This cascade reaction involves a Michael addition/intramolecular cyclization process and a broad scope of reversed regioselectivity products was prepared in a short reaction time with excellent yields. The reversed regioselectivity was also explained by DFT calculations
3‐Halochromones Through Oxidative α‐Halogenation of Enaminones and its Photophysical Investigation: Another Case of Photo‐induced Partially Aromatised Intramolecular Charge Transfer?
作者:José S. S. Neto、Filipe T. Coelho、Carlos V. Doerner、Antonio L. Braga、Luciano M. Lião、Felipe L. Coelho
DOI:10.1002/asia.202300852
日期:2024.1.15
wide range of 3-halo-4H-chromen-4-ones in good to excellent yields with great functional group tolerance. The analysis of the photophysical properties revealed a dual fluorescence emission in the violet-to-cyan assigned to a partially aromatised intramolecularchargetransfer mechanism.