One‐Pot Synthesis of Pyrimido[1,2‐a]benzimidazoles under Solvent‐Free Conditions |
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| Authors: | Ramin Ghorbani‐Vaghei Zahra Toghraei‐Semiromi Rahman Karimi‐Nami Zahra Salimi |
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| Affiliation: | 1. Department of Organic Chemistry, Faculty of Chemistry, Bu‐Ali Sina University 65174, Hamedan, Iran (phone/fax: +98‐811‐8257407);2. School of Chemistry, University College of Science, University of Tehran, P.O. Box 14155?–?6455, Tehran, Iran |
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| Abstract: | A series of pyrimido1,2‐a]benzimidazoles were obtained from aldehydes, 2‐aminobenzimidazole and ethyl acetoacetate in good‐to‐excellent yields by a simple, mild, and efficient procedure utilizing N,N,N′,N′‐tetrabromobenzene‐1,3‐disulfonamide (TBBDA) and poly(N‐bromo‐N‐ethylbenzene‐1,3‐disulfonamide) (PBBS) as catalysts. |
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| Keywords: | Aldehydes Pyrimido[1 2‐a]benzimidazoles Benzene‐1 3‐disulfonamide N N N′ N′ ‐tetrabromo‐ Poly(N‐bromo‐N‐ethylbenzene‐1 3‐disulfonamide) |
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