An efficient Mannich-type synthesis of bis(pyrido[2,1-b][1,3,5]thiadiazin-7-yl)-methanes
摘要:
Morpholinium 3-cyano-4-methyl-6-oxo-1,6-dihydropyridine-2-thiolate upon treatment with primary amines and a formaldehyde excess under mild conditions produces bis(pyrido[2,1-b][1,3,5]thiadiazin-7-yl)methane derivatives in good yields (67-87%).