A Green Synthetic Approach Towards One Pot Multi Component Synthesis of Hexahydroquinoline and 9‐Arylhexahydroacridine‐1,8‐dione Derivatives Catalyzed by Sulphonated Rice Husk
Sourav Dey, Puja Basak, Pranab Ghosh
Abstract
Abstract An efficient, straight forward, eco‐friendly procedure for the synthesis of biologically active hexahydroquinoline derivatives and hexahydroacridine‐1,8‐diones has been designed using a novel bio‐degradable heterogeneous catalyst, sulphonated rice‐husk (SRH). SRH provides high density of acid groups making it different from conventional solid acids containing single acid groups. We report an efficient protocol for the synthesis of hexahydroquinolines and hexahydroacridine‐1,8‐diones using this carbon based acid catalyst (SRH) in solvent free and greener solvent respectively. Moreover, operational simplicity, greener reaction condition, reusability of the catalyst, excellent yield (upto 98 %) are the fundamental features of this protocol. The metal free catalyst was characterised using different spectroscopic techniques FTIR, SEM, EDX, Powder XRD, ICP‐AES.