Abstract
Silica-grafted DBU-supported NiCl2 complex, 1-(3-((3-(silica-trioxysilyl) propyl) amino) propyl) azepan-2-one nickel chloride (SiO2@DBU-NiCl2), has been designed and synthesized by multistep approach and characterized by FT-IR, XRD, EDS, FE-SEM, TGA and XPS. Catalytic activity of SiO2@DBU-NiCl2 has been explored for A3 coupling of terminal alkynes, aldehydes and secondary amines resulting in excellent yields (up to 97%). Special features of present protocol are high TONs (625–1212) and TOFs (52–404), low catalyst loading (0.08 mol %), solvent-free conditions, facile recyclability and reusability of the catalyst (up to 5 times).
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