New xanthate-based radical cyclization onto alkynes
作者:Laurent El Kaïm、Laurence Grimaud、Luis D. Miranda、Emilie Vieu、M.-Angeles Cano-Herrera、Karel Perez-Labrada
DOI:10.1039/b924207d
日期:——
To bypass the failure of radicalcyclization involving a xanthate transfer on alkynes, a new reductive cyclization strategy has been completed with the use of a stoichiometric amount of dilauroyl peroxide in isopropanol. When the starting xanthates are prepared via a Ugi 4-component reaction with propargylamine, exomethylene lactams are formed in good yields.