Arylhydrazonothiazolidinones: Ring Cleavage and Alkylation of the 5-Arylhydrazono Derivatives of Rhodanine and Isorhodanine

N a z m i A . K a s s a b , S a n a a 0 . A b d A l l a h , a n d S a i d A . E l b a h a i i Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt Z. Naturforsch. 34b, 507-510 (1979); received September 28, 1978 Arylhydrazonorhodanines, Arylhydrazonoisorhodanines, Ring Cleavage, Triazolinones, Alkylation The 5-arylhydrazono derivatives of rhodanine and isorhodanine were subjected to the action of hydrazine hydrate to afford the arylhydrazonomercaptomethyl-triazolinones (3) and -triazolinthiones (3) respectively. Treatment of 1 with benzylamine afforded thioxalic acid dibenzylamide (5). On the other hand treatment of 2 with the same reagent afforded the corresponding benzylimino derivatives (6). Alkylation of 1 and 2 with ethyl bromoacetate and chloroacetamide yielded the corresponding S-alkyl derivatives (7) and (8), respectively.