Fe3O4@MCM-48–SO3H: An efficient magnetically separable nanocatalyst for the synthesis of benzo[f]chromeno[2,3-d]pyrimidinones

Introduction of organic/inorganic Fe3O4@MCM‐41@Zr‐piperazine magnetite nanocatalyst for the promotion of the synthesis of tetrahydro‐4H‐chromene and pyrano[2,3‐d]pyrimidinone derivatives

“…For the bare MNPs, Fe 3 O 4 usually shows bands at ~560 and 450 cm −1 , from Fe–O vibrations at tetrahedral and octahedral sites, respectively . In the FT‐IR spectra of the finally prepared reagent, there are stretching vibrations of O–H bonds at ~3435 cm −1 and bending vibrations of these bonds at 1635 cm −1 . An intense peak at 1000–1250 cm −1 corresponded to the Si‐O stretching vibrations in the amorphous silica shell .…”

Synthesis of spiro[benzochromeno[2,3-d]pyrimidin-indolines] using Fe3O4@MCM-41-SO3H@[HMIm][HSO4] as a magnetically separable nanocatalyst

“…In this study, in continuation of our previous work [22][23][24][25][26][27] (0.08 g) was stirred at 100°C under solvent-free conditions. The reaction products were monitored using thin-layer chromatography (TLC).…”

Synthesis, characterization, and catalytic application of Fe3O4‐Si‐[CH2]3‐N=CH‐aryl for the efficient synthesis of novel poly‐substituted pyridines

“…Fe 3 O 4 MNPs were synthesized according to our previous reports with a diameter about 20 nm . The synthesized Fe 3 O 4 nanoparticles were suspended by ultrasonic irradiation in a mixture of 150 mL of dry toluene containing a stoichiometric amount of 3‐aminopropyltrimethoxysilane.…”

“…In continuation of our previous work on the design of new nanocatalysts for organic synthesis, here we investigate the immobilization of benzaldehyde derivatives on amino‐functionalized Fe 3 O 4 for the preparation of novel 1‐aryl‐ N ‐propylsysilyl‐metahnimine@Fe 3 O 4 (APSMI@ Fe 3 O 4 , Fe 3 O 4 ‐Si‐(CH 2 ) 3 ‐N=CH‐Aryl,) and 1‐aryl‐ N ‐propylsysilyl‐metahnamine@Fe 3 O 4 (APSMA@Fe 3 O 4 , Fe 3 O 4 ‐Si‐(CH 2 ) 3 ‐NH‐CH 2 ‐Aryl) MNPs and study their performances as strong, recoverable, and stable catalysts for the synthesis of some novel poly‐substituted pyridine derivatives. Also, the effect of substitution on the aromatic ring of APSMI@Fe 3 O 4 on the time and yield of the reaction is investigated.…”