Alkylation/Ipso-cyclization of Active Alkynes Leading to 3-Alkylated Aza- and Oxa-spiro[4,5]-trienones
Pu Chen, Jian‐Hong Fan, Wen-Qin Yu, Biquan Xiong, Yu Liu, Kewen Tang, Jun Xie
Abstract
alkylation/ipso-cyclization of activated alkynes with 4-alkyl-DHPs under transition-metal-free conditions is proposed. This alkylation successively undergoes the generation of alkyl radicals, addition of alkyl radicals to the alkynes, and intramolecular ipso-cyclization. The mechanism studies suggest that the alkylation/ipso-cyclization involves a radical process. This ipso-cyclization procedure shows a series of advantages, such as accessibility, mild conditions, high efficiency, greater safety, and an environmentally friendly method.
Topics & Concepts
AlkylationChemistryRadicalAlkylIntramolecular forceRadical cyclizationMedicinal chemistryOrganic chemistryCatalysisRadical Photochemical ReactionsCatalytic C–H Functionalization MethodsSulfur-Based Synthesis Techniques