[38] N. Baig, G.M. Shelke, A. Kumar, A.K. Sah, Selective Synthesis of Bis (indolyl) methanes Under Solvent
Free Condition Using Glucopyranosylamine Derived cis-Dioxo Mo (VI) Complex as an Efficient Catalyst,
Catal. Lett., 146 (2016) 333-337.
[39] K. Abdelbaqi, N. Lack, E.T. Guns, L. Kotha, S. Safe, J.T. Sanderson, Antiandrogenic and growth
inhibitory effects of ring‐substituted analogs of 3, 3′‐diindolylmethane (Ring‐DIMs) in
hormone‐responsive LNCaP human prostate cancer cells, The Prostate, 71 (2011) 1401-1412.
[40] G. Sharma, J.J. Reddy, P.S. Lakshmi, P.R. Krishna, A versatile and practical synthesis of bis (indolyl)
methanes/bis (indolyl) glycoconjugates catalyzed by trichloro-1, 3, 5-triazine, Tetrahedron Lett., 45
(2004) 7729-7732.
[41] S. Khaksar, S.M. Talesh, A simple, efficient and green procedure for the synthesis of bis-indolyl
methanes in 1, 1, 1, 3, 3, 3-hexafluoro-2-propanol, J. Fluorine Chem., 135 (2012) 87-90.
[42] S. Khaksar, S.M. Ostad, Pentafluorophenylammonium triflate as an efficient, environmentally
friendly and novel organocatalyst for synthesis of bis-indolyl methane derivatives, J. Fluorine Chem., 132
(2011) 937-939.
[43] M.A. Zolfigol, R. Ayazi-Nasrabadi, S. Baghery, The first urea-based ionic liquid-stabilized magnetic
nanoparticles: an efficient catalyst for the synthesis of bis (indolyl) methanes and pyrano [2, 3-d]
pyrimidinone derivatives, Appl. Organomet. Chem., 30 (2016) 273-281.
[44] Y. Wang, R. Sang, Y. Zheng, L. Guo, M. Guan, Y. Wu, Graphene oxide: An efficient recyclable solid
acid for the synthesis of bis (indolyl) methanes from aldehydes and indoles in water, Catal. Commun., 89
(2017) 138-142.
[45] H. Firouzabadi, N. Iranpoor, A.A. Jafari, Aluminumdodecatungstophosphate (AlPW 12 O 40), a
versatile and a highly water tolerant green Lewis acid catalyzes efficient preparation of indole
derivatives, J. Mol. Catal. A: Chem., 244 (2006) 168-172.
[46] Z.-H. Zhang, L. Yin, Y.-M. Wang, An efficient and practical process for the synthesis of bis (indolyl)
methanes catalyzed by zirconium tetrachloride, Synthesis, 2005 (2005) 1949-1954.
[47] H.A. Soliman, A.Y. Mubarak, S.S. Elmorsy, An efficient synthesis of bis (indolyl) methanes and N, N′-
alkylidene bisamides by Silzic under solvent free conditions, Chin. Chem. Lett., 27 (2016) 353-356.
[48] D. Pore, U.V. Desai, T. Thopate, P. Wadgaonkar, A mild, expedient, solventless synthesis of bis
(indolyl) alkanes using silica sulfuric acid as a reusable catalyst, ARKIVOC, 12 (2006) 75-80.
[49] S.R. Mendes, S. Thurow, F. Penteado, M.S. da Silva, R.A. Gariani, G. Perin, E.J. Lenardão, Synthesis of
bis (indolyl) methanes using ammonium niobium oxalate (ANO) as an efficient and recyclable catalyst,
Green Chem., 17 (2015) 4334-4339.
[50] R.M.N. Kalla, S.C. Hong, I. Kim, Synthesis of Bis (indolyl) methanes Using Hyper-Cross-Linked
Polyaromatic Spheres Decorated with Bromomethyl Groups as Efficient and Recyclable Catalysts, ACS
Omega, 3 (2018) 2242-2253.
[51] Z.-H. Ma, H.-B. Han, Z.-B. Zhou, J. Nie, SBA-15-supported poly (4-styrenesulfonyl
(perfluorobutylsulfonyl) imide) as heterogeneous Brønsted acid catalyst for synthesis of
diindolylmethane derivatives, J. Mol. Catal. A: Chem., 311 (2009) 46-53.
[52] A. Modak, J. Mondal, A. Bhaumik, Highly Porous Organic Polymer containing Free‐CO2H Groups: A
1749-1753.
[53] A.R. Kiasat, J. Davarpanah, Fe3O4@ silica sulfuric acid nanoparticles: An efficient reusable
nanomagnetic catalyst as potent solid acid for one-pot solvent-free synthesis of indazolo [2, 1-b]
phthalazine-triones and pyrazolo [1, 2-b] phthalazine-diones, J. Mol. Catal. A: Chem., 373 (2013) 46-54.
[54] P. Gholamzadeh, G.M. Ziarani, N. Lashgari, A. Badiei, P. Asadiatouei, Silica functionalized propyl
sulfonic acid (SiO2-Pr-SO3H): An efficient catalyst in organic reactions, J. Mol. Catal. A: Chem., 391
(2014) 208-222.
22