Cyclization of 1,3-dialkyl-4,5-bis(1-thiosemicarbazido)-imidazolidin-2- ones(thiones) with aromatic aldehydes

摘要

Cyclization of 1,3-dialkyl-4,5-bis(1-thiosemicarbazido)imidazolidin-2- ones(thiones) with aromatic aldehydes under acidic catalysis affords 1,3-dialkyl-4-(arylideneamino)-5-thioxohexahydroimidazo[4,5-d]imidazol-2(1H) -ones and 5,7-dialkyltetrahydro-1H-imidazo[4,5-e]-1,2,4-triazine-3,6(2H,4H)- dithiones.