Abstract 4-Aminomorpholine, 1-aminopiperidine, and 1, 1-dimethylhydrazine were carried out in the corresponding methyl dithiocarbamates and those in turn in aminohydrazinethioamides, which under the influence of acid chlorides (benzoyl, 4- chlorobenzoyl, 4-fluorobenzoyl, 4-methoxybenzoyl and 2-furoyl) gave arylcarbonyl derivatives. Those compounds were cyclized in concentrated H 2 SO 4 to 2-(N- ...