Fe₃O₄@nano-cellulose/Cu(ii): a bio-based and magnetically recoverable nano-catalyst for the synthesis of 4H-pyrimido[2,1-b]benzothiazole derivatives

Abstract

Fe3O4@nano-cellulose/Cu(ii) as a green bio-based magnetic catalyst are prepared, characterized and applied for synthesis of 4H-pyrimido[2,1-b]benzothiazoles with good to excellent yields.

Rapid Four-component Synthesis of Dihydropyrano[2,3-c]pyrazoles using Nano-egg Shell/Ti(IV) as a Highly Compatible Natural Based Catalyst

“…In continuation of our previous works in solid acids [33][34][35][36][37][38], herein, we have reported an e cient one-pot four-component reaction protocol for the synthesis of DHPPs in the presence of NEST as a highly effective nanocatalyst in good to excellent yields under mild conditions (Scheme 1).…”

Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

“…In continuation of our previous works in using solid acid catalysts [33][34][35][36][37][38], herein, we reporte an efficient one-pot four-component reaction protocol for the synthesis of DHPPs in the presence of nano-eggshell/Ti(IV) (NEST) as a highly effective nanocatalyst in good to excellent yields under mild conditions (Scheme 1).…”

Recent advances in the application of magnetic bio-polymers as catalysts in multicomponent reactions

“…The reaction of nano-cellulose 5, FeCl 3 ·6H 2 O, FeCl 2 ·4H 2 O, and NH 4 OH at 80 °C gave Fe 3 O 4 @nano-cellulose 8, which was reacted with CuCl 2 using sodium hydroxide at room temperature to obtain Fe 3 O 4 @nano-cellulose/Cu( ii ) 90 ( Scheme 24 ). 61 …”