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
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