Visible light mediated, metal-free carbene transfer reactions of diazoalkanes with propargylic alcohols
作者:Feifei He、Rene M. Koenigs
DOI:10.1039/c9cc00927b
日期:——
The development of efficient carbene transferreactions under mild reaction conditions is very important to access small molecules for applications in organic synthesis and drug discovery. Herein, we describe the application of blue light in photochemical carbene transferreactions of donor acceptor diazoalkanes under mild reaction conditions with propargylic alcohols, which provides – in contrast
practical synthesis of important tetronicacidsfrom easily available propargylic alcohols and carbon dioxide is reported for the first time. This transition-metal-free transformation features high atom- and step-economy, mild reaction conditions, good functional group tolerance and high yield. Preliminary mechanistic studies suggest that the reaction proceeds via cyclization to give alkylidene cyclic carbonate