M. Goswami et al.
Conclusions
An efficient, simple, and green method was developed for synthesis of benzimi-
dazole and benzothiazole derivatives using sulfonic-acid-modified activated carbon
(MTLAC–SA) as very effective and recyclable catalyst. The catalytic activity of
MTLAC–SA was found to be superior to that of a catalyst prepared by modification
of montmorillonite K10 (K10–SA). The synthesis procedure for both catalysts was
very simple and cost effective. Short reaction time, good to excellent yield of
product, room-temperature condition, and use of inexpensive and reusable catalysts
make this method both economically and environmentally suitable.
Acknowledgements Financial support from DST [grant no. SR/NM/NS-18/2011(G)] is gratefully
acknowledged. M.M.D. thanks UGC for a research fellowship. We also acknowledge support from the
Department of Chemistry, Gauhati University, SAIF-GU, SAIF-NEHU, and CIF-IITG for all the
analytical facilities used during the course of this investigation.
References
1. M. Gaba, S. Singh, C. Mohan, Eur. J. Med. Chem. 76, 494 (2014)
2. M.J. Tebbe, W.A. Spitzer, F. Victor, S.C. Miller, C.C. Lee, T.R. Sattelberg Sr., E. Mckinney, J.C.
Tang, J. Med. Chem. 40, 3937 (1997)
3. V.K. Vyas, M. Ghate, Mini-Rev. Med. Chem. 10, 1366 (2010)
4. A. Mavrova, K.K. Anichina, D.I. Vuchev, J.A. Tsenov, P.S. Denkova, M.S. Kondeva, M.K. Micheva,
Eur. J. Med. Chem. 41, 1412 (2006)
5. N.C. Desai, N.R. Shihory, G.M. Kotadiya, P. Desai, Eur. J. Med. Chem. 82, 480 (2014)
6. V. Zaharia, A. Ignat, N. Palibroda, B. Ngameni, V. Kuete, C.N. Fokunang, M.L. Moungang, B.T.
Ngadjui, Eur. J. Med. Chem. 45, 5080 (2010)
7. A. Kamal, M.N.A. Khan, K.S. Reddy, K. Rohini, Bioorg. Med. Chem. 15, 1004 (2007)
8. F. Azam, B.A. El-Gnidi, I.A. Alkskas, M.A. Ahmed, J. Enzyme Inhib. Med. Chem. 25, 818 (2010)
9. A.R. Porcari, R.V. Devivar, L.S. Kucera, J.C. Drach, L.B. Townsend, J. Med. Chem. 41, 1252 (1998)
10. M.T. Migawa, J.L. Giradet, J.A. Walker, G.W. Koszalka, S.D. Chamber-Lain, J.C. Drach, L.B.
Townsend, J. Med. Chem. 41, 1242 (1998)
11. W.A. Denny, G.W. Rewcastle, B.C. Bagley, J. Med. Chem. 33, 814 (1990)
12. T. Forseca, B. Gigante, T.L. Gilchrist, Tetrahedron 57, 1793 (2001)
13. S. Aiello, G. Wells, E.L. Stone, H. Kadri, R. Bazzi, D.R. Bell, M.F.G. Stevens, C.S. Matthews, T.D.
Bradshaw, A.D. Westwell, J. Med. Chem. 51, 5135 (2008)
14. S.J. Choi, H.J. Park, S.K. Lee, S.W. Kim, G. Han, H.Y.P. Choo, Bioorg. Med. Chem. 14, 1229 (2006)
15. D. Alagille, R.M. Baldwin, G.D. Tamagnan, Tetrahedron Lett. 46, 1349 (2005)
16. S.J. Ji, H.B. Shi, Dyes Pigm. 70, 246 (2006)
17. J. Azizian, P. Torabi, J. Noei, Tetrahedron Lett. 57, 185 (2016)
18. A. Dandia, V. Parewa, K.S. Rathore, Catal. Comm. 28, 90 (2012)
19. R. Shelkar, S. Sarode, J. Nagarkar, Tetrahedron Lett. 54, 6986 (2013)
20. Z.H. Zhang, J.J. Li, Y.Z. Gao, Y.H. Liu, J. Heterocycl. Chem. 44, 1509 (2007)
21. D. Villemin, M. Hammadi, B. Martin, Synth. Commun. 26, 2895 (1996)
22. Y. Wang, K. Sarris, D.R. Sauer, S.W. Djuric, Tetrahedron Lett. 47, 4823 (2006)
23. A.K. Chakraborti, C. Selvam, G. Kaur, S. Bhagat, Synlett 5, 0851 (2004)
24. X. Wen, J.E. Bakali, R. Deprez-Poulain, B. Deprez, Tetrahedron Lett. 53, 2440 (2012)
25. G.M. Raghavendra, A.B. Ramesha, C.N. Revanna, K.N. Nandeesh, K. Mantelingu, K.S. Rangappa,
Tetrahedron Lett. 52, 5571 (2011)
26. R.N. Nadaf, S.A. Siddiqui, T. Daniel, R.J. Lahoti, K.V. Srinivasan, J. Mol. Catal. A: Chem. 214, 155
(2004)
27. M.S. Mayo, X. Yu, X. Zhou, X. Feng, Y. Yamamoto, M. Bao, Org. Lett. 16, 764 (2014)
28. M.S. Mayo, X. Yu, X. Zhou, X. Feng, Y. Yamamoto, M. Bao, J. Org. Chem. 79, 6310 (2014)
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