Selective Synthesis of Bis(indolyl)methanes Under Solvent Free Condition Using Glucopyranosylamine Derived cis-Dioxo Mo(VI) Complex as an Efficient Catalyst

cis -Dioxomolybdenum(VI) complex of 4,6- O -ethylidene- β - d -glucopyranosylamine derived ligand has been used as an efficient catalyst in the selective synthesis of a series of bis(indolyl)methanes (BIMs) by condensing indole derivatives with carbonyl compounds. The adopted synthetic procedure is green in nature as solvent free reactions have been carried out using naturally occurring d -glucose derived ligands. Total 15 BIMs have been synthesised including four new ones, which have been characterized by mp, FTIR, NMR and mass spectroscopy. The catalyst has afforded good to excellent yield of BIMs in short reaction time and the former has been recycled five times without any significant loss in it’s catalytic efficiency. Graphical Abstract