Synthesis and antinociceptive activity of 4,4′-bis(1-substituted-semicarbazidyl)diphenylmethane and 4,4′-bis(5-substituted-2,4-dihydro-3-oxo-3H-1,2,4-triazol-4-yl)diphenylmethane derivatives

In the reaction of 4,4'-diphenylmethane diisocyanate with carboxylic acid hydrazides, 4,4'-bis(1-substituted-semicarbazidyl) diphenylmethane derivatives were obtained. Depending on their chemical nature, cyclization of these compounds in alkaline medium led to the formation of two groups of compounds: bis(2,4-dihydro-3H-1,2,4-triazol-3-one) derivatives or carboxylic acids. The pharmacological effects of the selected compounds on the central nervous system in mice were investigated. Strong antinociceptive properties of some derivatives, at a wide range of doses, were observed.