Browsing by Author "Ranjit Thakuria"

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In(OTf)3 catalyzed reductive etherification of 2-aryloxybenzaldehydes and 2-(arylthio)benzaldehydes
(Elsevier Ltd, 2019) Anamika Prajapati; Mahendra Kumar; Ranjit Thakuria; Ashok K. Basak
2-Aryloxybenzaldehydes and 2-(arylthio)benzaldehydes undergo reductive etherification in presence of 5 mol% In(OTf)3 and stoichiometric amount of Et3SiH under solvent free conditions to generate novel symmetrical dibenzyl ethers and thioethers in excellent yields. In(OTf)3 is found to be superior in terms of catalytic activity over the other metal triflates tested for the reaction. Xanthenes and thioxanthenes, as anticipated, could not be obtained under these conditions. © 2019
Stereoselective synthesis of 9-vinyl substituted unsymmetrical xanthenes and thioxanthenes
(Elsevier Ltd, 2020) Anamika Prajapati; Mahendra Kumar; Ranjit Thakuria; Ashok K. Basak
Activated 2°-allylic alcohols derived from 2-aryloxybenzaldehydes and 2-(arythio)benzaldehydes undergo intramolecular Friedel-Crafts alkylation reaction when heated with catalytic amount of a Lewis acid in 1,2-dichloroethane to provide highly E-selective 9-vinyl substituted unsymmetrical novel xanthenes and thioxanthenes in good yields. © 2020 Elsevier Ltd