Bacterial biosynthesis of nanosilver: a green catalyst for the synthesis of (amino pyrazolo)-(phenyl)methyl naphth-2-ol derivatives and their antimicrobial potential

The ability of aminoethyl methacrylate cationic copolymers to stabilize silver nanoparticles in water was investigated. Sodium borohydride (NaBH4) was employed as a reducing agent for the preparation of silver nanoparticles. The objects were studied by ultraviolet-visible (UV-vis) spectroscopy, dynamic light scattering (DLS), analytical ultracentrifugation (AUC) and scanning electron microscopy (SEM). Formation of nanoparticles in different conditions was investigated by varying ratios between components (silver salt, reducing agent and polymer) and molar masses of copolymers. As a result, we were successful in obtaining nanoparticles with a relatively narrow size distribution that were stable for more than six months. Consistent information on nanoparticle size was obtained. The holding capacity of the copolymer was studied.

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Fast and Efficient Green Procedure for the Synthesis of Benzo[5,6]chromene Derivatives and Their Sulfur Analogues in Water by Organocatalyst Potassium Phthalimide-N-oxyl

Synthesis ◽

10.1055/s-0037-1610755 ◽

2020 ◽

Vol 52 (11) ◽

pp. 1707-1718

Author(s):

Nasser Etivand ◽

Jabbar Khalafy ◽

Mohammad G. Dekamin

Keyword(s):

Aqueous Media ◽

Thiobarbituric Acid ◽

Environmentally Benign ◽

The Novel ◽

One Pot ◽

Synthetic Strategy ◽

Three Component Reaction ◽

High Yields ◽

Green Procedure ◽

Arylglyoxal Monohydrates

A simple, clean, straightforward, and environmentally benign one-pot, three-component reaction of various arylglyoxal monohydrates, β-naphthol, and barbituric acid [pyrimidine-2,4,6(1H,3H,5H)-trione] or thiobarbituric acid in the presence of catalytic amounts potassium phthalimide-N-oxyl (PPINO), as a mild and efficient organocatalyst in aqueous media under reflux conditions is reported. This transformation produced the novel diverse-substituted 12-benzoyl-8,12-dihydro-9H-benzo[5,6]chromeno[2,3-d]pyrimidine-9,11(10H)-diones and their sulfur analogues in 82–93% yield via filtration and without utilization of any chromatography. The high yields of products, very simple operation, easy workup, availability of starting materials, green process, and high atom-economy are the main benefits of this synthetic strategy.

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Studies on the Synthesis of Substituted 2-amino-4H-benzo[h]chromene and 3-amino-1H-benzo[f]chromene Derivatives Using Base Supported Ionic Liquid Like-phase (SILLP) as an Efficient Green Catalyst

Journal of Chemical Research ◽

10.3184/174751917x14815427219202 ◽

2017 ◽

Vol 41 (1) ◽

pp. 21-24

Author(s):

Leila Kheirkhah ◽

Manouchehr Mamaghani ◽

Nosrat Ollah Mahmoodi ◽

Asieh Yahyazadeh ◽

Seyedeh Saeedeh Mirnezami Ziabari

Keyword(s):

Ionic Liquid ◽

One Pot ◽

Green Catalyst ◽

Supported Ionic Liquid ◽

Three Component Reaction

The synthesis of several substituted 2-amino-4 H-benzo[ h]chromene and 3-amino-1 H-benzo[ f]chromene derivatives was carried out using a one-pot three-component reaction of an arylaldehyde, malononitrile and a naphthol in H2O and in the presence of recyclable base supported ionic liquid like-phase as an efficient green catalyst.

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