Fe₃O₄@silica‐MCM‐41@DABCO: A novel magnetically reusable nanostructured catalyst for clean <i>in situ</i> synthesis of substituted 2‐aminodihydropyrano[3,2‐<i>b</i>]pyran‐3‐cyano

Abstract

DABCO (1,4‐diazabicyclo[2.2.2]octane)‐modified magnetite with silica‐MCM‐41 shell (Fe 3 O 4 @silica‐MCM‐41@DABCO) as an effective, magnetic and novel heterogeneous reusable nanocatalyst was synthesized and analysed using various techniques. Evaluation of the catalytic activity of this nanocatalyst was performed in the clean synthesis of substituted 2‐aminodihydropyrano[3,2‐ b ]pyran‐3‐cyano in high yields via in situ reaction of azido kojic acid, malononitrile and various aldehydes.