Selectivity in Ketenimine-Thioketone Cycloadditions. 1. 1,4- and 1,2-Addition Pathways and the Synthesis of 4H-3,1-Benzothiazines, 2-Iminothietanes, and Thioacrylamides

Article abstract of DOI:10.1021/jo01307a009

The cycloadditions of thiobenzophenones to ketenimines take place at different sites of the cumulene depending on the extent of substitution and the nature of the substituents.C,C-Disubstituted ketenimines whose nitrogen bears an alkyl or an ortho,ortho'-