Convenient syntheses of 5-[(2-methyl-5-nitro-1<i>H</i>-imidazol-1-yl)methyl]-1,3,4-oxadiazole-2(3<i>H</i>)thione and N-substituted 2-amino-5-[(2-methyl-5-nitro-1<i>H</i>-imidazol-1-yl)methyl]-1,3,4-thiadiazoles
compound 10 afforded alkyl 2-(5-[(2-methyl-5-nitro-1H-imidazol-1-yl)methyl]-1,3,4-oxadiazol-2-ylthio)acetate (11) in good yield. Reaction of hydrazide 9 with substituted isothiocynate yielded 1-[2-(2-methyl-5-nitro-1H-imidazol-1-yl)acetyl]-4-aryl(or ethyl)thiosemicarbazide (12) which was cyclized in acidic media to N-substituted2-amino-5-[(2-methyl-5-nitro-1H-imidazol-1-yl)methyl]-1,3,4-thiadiazole (13)