Synthesis and Biological Activities of Derivatives of Mercaptobenzimidazoles. Part-II : Some Reactions of 2-Mercapto- 5 (or 6)-Nitro and 2-Mercapto-4 (or 7)-Nitrobenzimidazoles

University College of Pharmaceutical Sciences,Kakatiya University, Warangal-506 009 Manuscript received 5 June 1981, revised 28 June 1983,accepted 15 September 1983 THE syntheses and biological activities of certain perhydrothiazino-, perhydrothiazolobenzimidazoles and thlazolo[3,2-a}benzimidazole-3(2H)-ones and their benzylidene derivatives have been reported1-7. As a part of our studies on substituted mercaptobenzimidazoles8 , we report here some cyclization reactions of 2-mercapto-4 (or 7)-nitro and 2-mercapto-5 (or 6)-nitrobenzimidazoles (Scheme 1). and the biological activities of the products