H. Shimizu et al., A regioselective addition of nucleophiles to monocyclic 1,2-thiazinylium perchlorate: a novel precursor of 6-substituted 1,2-thiazines, TETRAHEDRON, 57(43), 2001, pp. 8965-8969
The nucleophilic addition reactions of 4,5-diphenyl-1,2-thiazinylium perchl
orate 1 regioselectively proceeded to give 6-alkoxy-3a-c and 6-alkyl-1,2-th
iazines 3e-f, 4f, 3i-j in good to high yields. The Friedel-Crafts type reac
tion with arenes also afforded 6-aryl adducts 6a-c. (C) 2001 Elsevier Scien
ce Ltd. All rights reserved.