Synthesis of 2-Substituted 5- (1-Oxido-4-pyridyl) -and 5- (1-Oxido-2-pyridyl) -1, 3, 4-thiadiazole Derivatives by Substitution of 2-Methylsulfonyl Group with Various Nucleophiles

Abstract

The synthesis of 2-substituted 5- (1-oxido-4-pyridy1) - (4a-10a) and 5- (1-oxido-2-pyridyl) -1, 3, 4-thiadiazole derivatives (4b-10) by substitution reaction of 5- (1-oxido-4-pyridyl) - (3a) and 5- (1-oxido-2-pyridyl) -2-methylsulfonyl-1, 3, 4-thiadiazole (3b) is described. 5- (1-Oxido-4-pyridyl) - (9a) and 5- (1-oxido-2-pyridyl) -1, 3, 4-thiadiazole (9b) could be reduced with sodium dithionite to 2- (4-pyridyl) - (11c) and 2- (2-pyridyl) -1, 3, 4-thiadiazole (11d)