Visible-Light-Mediated Vicinal Difunctionalization of Activated Alkynes with Boronic Acids: Substrate-Controlled Rapid Access to 3-Alkylated Coumarins and Unsaturated Spirocycles
作者:Sabyasachi Manna、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.2c04333
日期:2023.2.10
visible-light-mediated difunctionalization of activated alkynes with boronic acid is unveiled to synthesize 3-alkylated coumarins and unsaturated spiro-lactones. The substituent at the para-position of the aryl ring of aryl alkynoate plays a pivotal role in the selective formation of chain-alkylated coumarins or spirocyclic compounds undermildconditions. The reaction employs a hypervalent iodine reagent