Nano-sawdust–BF3 as a new, cheap, and effective nano catalyst for one-pot synthesis of 2-amino benzo[h]chromene derivatives

Abstract

An atom-efficient, three-component synthetic methodology has been developed for the preparation of biologically important 2-amino benzo[h]chromene using nano-sawdust-BF 3 as a new catalyst. The reaction involves the use of 2-naphthol, malononitrile, and various aldehydes. A wide range of aldehydes is compatible in this reaction, producing excellent yields in short time. The morphology of nanocatalyst (nano-sawdust-BF 3 ) was observed using a scanning electron microscopy. Also, the sawdust-BF 3 surface was studied by energy dispersive X-ray spectroscopic method to find out the chemical composition.

Waste-to-wealth transition: application of natural waste materials as sustainable catalysts in multicomponent reactions

“…The nanostructure of nano-sawdust–BF 3 was studied by SEM (size <100 nm), while EDX analysis affirmed the presence of C, O, B, and F. The various advantages comprise shorter reaction times, simple work-up, and excellent yields. 86,87…”

“…85 Powdered sawdust was reacted with BF 3 -Oet 2 to produce nano-sawdust-BF 3 , which was used to provide 2-aminobenzo affirmed the presence of C, O, B, and F. The various advantages comprise shorter reaction times, simple work-up, and excellent yields. 86,87 Mirjalili and Zare used BF 3 /nano-sawdust as a catalyst in the synthesis of dihydro-2-oxopyrroles 56 by the treatment of aldehyde 1, amines 5, and dialkylacetylenedicarboxylates 55 under reflux conditions via a pseudo-four-component reaction (Scheme 36). 88 Dried sawdust was also reacted with SbCl 5 to generate nano-sawdust-OsnCl 3 , as examined by FT-IR, FE-SEM, and EDX; the size of the nanoparticles was below 100 nm, as found from the SEM image.…”

Synthesis of Nanostructured sawdust-BF3: An efficient reagent for synthesis of 2,3,5-substituted-2H-pyrazole derivatives

“…The reaction mixture was then stirred and then after 30 min, the ashy powder was separated and dried in an oven at 60°C for 4h and then pulverized at the mortar [18]. The morphology and size of sawdust-BF3 NPs was observed by SEM images.…”

Preparation and characterization of BF3 supported on coconut shell as a novel and effective nano-catalyst for one-pot synthesis of pyrano[2,3-d]pyrimidines

“…Recently, nano-solid-supported reagents such as nanocrystalline TiO 2 -HClO 4 [17], nano-TiCl 4 •SiO 2 [18], nano-SnCl 4 •SiO 2 [19], nano-sawdust-BF 3 [20], nano-sawdust-OSO 3 H [21], BF 3 -SiO 2 nano-particles [22], HClO 4 -SiO 2 nano-particles [23], nano-cellulose-OSO 3 H [24], nano-silica sulfuric acid [25], SbCl 5 /SiO 2 nano-particles [26], Pt@GO-PVP nano-composite [27], RhPt/TC@GO NPs [28], graphene oxide [29], and monodisperse Pt NPs@AC [30] have developed due to the high activity and selectivity [31].…”

“…During the course of our studies and investigations on the synthesis of pyrano[2,3-d]pyrimidine compounds and our interest in MCRs [20][21][22][23][24][25], we intended to study the feasibility of synthesizing their derivatives by the one-pot threecomponent condensation reactions strategy of aromatic aldehydes (1a-j) with ethyl cyanoacetate or malononitrile 2 and barbituric acid 3 in the presence of boron trifluoride supported on coconut shell (nano-BF 2 O-coc) as a novel nanocatalyst at reflux ethanol (Scheme 1).…”