π-Annulation reactions of 4-thiazolidinone enaminones in the synthesis of fused bi- and tri-cyclic compounds
作者:Bojan P. Bondžić、Zdravko Džambaski、Aleksandra M. Bondžić、Rade Marković
DOI:10.1016/j.tet.2012.09.080
日期:2012.11
reactivity of α-C of the exocyclic double bond (a so called push pull system) to obtain bicyclic fused thiazolidinones via π-annulation cyclization. Appropriate reaction conditions to selectively activate this position and secondary nitrogen towards N,π-annulation were found. Furthermore, the intramolecular vinylogous iminium ion 6-exo-trig cyclization was used to access fused bicyclic precursors for the