“…The isomeric phenyl-substituted thiazolo-1,2,4-triazines, 3-phenyl-6,7-dihydro-4H- [1,3]thiazolo [2,3-c] [1,2,4]triazin-4-one (2a) and 6-phenyl-2,3-dihydro-7H- [1,3]thiazolo [3,2-b]- [1,2,4]triazin-7-one (3a), were prepared from 6-phenyl-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one (1a) (Scheme 1). [16] The ethyl-(2b and 3b) and benzyl-substituted (2c and 3c) Scheme 1.…”