Visible Light-Mediated [2 + 2] Cycloaddition Reactions of 1,4-Quinones and Terminal Alkynes
作者:Shaista Sultan、Muneer-ul-Shafi Bhat、Masood Ahmad Rizvi、Bhahwal Ali Shah
DOI:10.1021/acs.joc.9b00855
日期:2019.7.19
single-step synthesis of 4-hydroxy-functionalized bi-aryl and aryl/alkyl ketones via oxidative coupling of terminal alkynes with benzoquinones is reported. Furthermore, with naphthoquinones, owing to the cross-resonance of carbonyl with the aromatic ring, alkene–alkyne cycloaddition is more favored to give four-membered carbocyclic adducts, thereby precluding the requirement of preactivated alkynes.
据报道,通过末端炔烃与苯醌的氧化偶联,一步合成4-羟基官能化的双芳基和芳基/烷基酮。此外,对于萘醌,由于羰基与芳环的交叉共振,更有利于烯烃-炔烃环加成生成四元碳环加合物,从而排除了对预活化炔烃的需求。