Silica-Supported Boric Acid with Ionic Liquid: A Novel Recyclable Catalytic System for One-Pot Three-Component Mannich Reaction

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  • Kumar Vishal
    Natural Plant Products Division, Institute of Himalayan Bioresource Technology (Council of Scientific & Industrial Research)
  • Sharma Upendra
    Natural Plant Products Division, Institute of Himalayan Bioresource Technology (Council of Scientific & Industrial Research)
  • Verma Praveen Kumar
    Natural Plant Products Division, Institute of Himalayan Bioresource Technology (Council of Scientific & Industrial Research)
  • Kumar Neeraj
    Natural Plant Products Division, Institute of Himalayan Bioresource Technology (Council of Scientific & Industrial Research)
  • Singh Bikram
    Natural Plant Products Division, Institute of Himalayan Bioresource Technology (Council of Scientific & Industrial Research)

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A rapid and efficient silica-supported boric acid/ionic liquid ([bmim][PF6]), catalyzed, one-pot three-component Mannich reaction has been carried out to synthesize β-amino carbonyl compounds at room temperature. The reaction afforded desired products in excellent yields with moderate to good diastereoselectivity. The method provides a novel modification of three-component Mannich reaction in terms of mild reaction conditions, clean reaction profiles, low amount of catalyst, recyclability of catalyst and a simple workup procedure. The present report first time describes the preparation of H3BO3–SiO2 catalyst and its use with [bmim][PF6], to synthesize Mannich products. The catalyst can be reused at least seven times.

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