CHHANDA MUKHOPADHYAY

Chemistry

B K BANIK

A T REDDY

A DATTA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Tetrahedron Letters

A wide variety of 2-substituted benzimidazoles and bis-benzimidazoles were synthesized in high yields by PEG-mediated catalyst-free synthesis under solvent-less conditions. The products were directly recrystallized from hot methanol. The reaction occurred giving excellent yields with low as well as high molecular weight PEGs. © 2008 Elsevier Ltd. All rights reserved.

PEG-mediated catalyst-free expeditious synthesis of 2-substituted benzimidazoles and bis-benzimidazoles under solvent-less conditions

An oxyphosphate of formula BiCa4(PO4)3O was prepared and characterized by powder XRD, Fourier transform infrared spectroscopy (FTIR), and SEM-EDAX techniques. The catalytic activity of the synthesized compound was explored in the preparation of 3,4-dihydropyrimidin-2(1H)-one using Biginelli reaction. Influence of parameters such as temperature and solvent on this reaction using this heterogeneous catalyst was studied. A higher yield of 98% of the 3,4-dihydropyrimidin-2(1H)-one was achieved within 120 min of duration at room temperature in the presence of acetic acid (AcOH). © 2017 Taylor &amp; Francis Group, LLC.

Inorganic and Nano-Metal Chemistry

Room temperature synthesis of 3,4-dihydropyrimidin-2(1H)-one using apatite like oxyphosphate

Aliovalent ion substituted fluorapatite of formula Bi0.5Na0.5Ca4(PO4)3F was synthesized by co-precipitation method and characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and energy dispersive X-ray spectroscopy. The catalytic activity of the synthesized compound was tested on one pot multicomponent reaction (Biginelli reaction) for the synthesis of 3,4-dihydropyrimidin-2(1H)-one and its derivatives. The compounds were confirmed by spectroscopic techniques and melting point. An enhanced yield was observed with this catalyst for the condensation of ethyl acetoacetate, urea and benzaldehyde compared to unsubstituted fluorapatite.

Reaction Kinetics, Mechanisms and Catalysis

Synthesis, characterization and catalytic activity of modified fluorapatite towards the multicomponent one-pot Biginelli condensation

Mono, di and trivalent ions containing hydroxyapatite of the formula BiNaCa 3(PO 4) 3OH has been synthesized and the compound's catalytic activity in three component Biginelli condensation was studied. The compound was characterized by powder XRD, FT-IR, SEM and TGA/DTA techniques. The unit cell dimensions of the compound were determined to be a = 9.412(2) , C = 6.92(2) and the unit cell volume is 530.9 3. The substituted hydroxyapatite phase showed enhanced reactivity in the one pot synthesis of 3,4-dihydropyrimidin-2(1H)-one by Biginelli reaction and resulted in an increased yield of the product. © 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Ceramics International

Synthesis of apatite structure based BiNaCa3(PO4)3OH and its application for condensation reaction

Heterocycles

Dowex 50W in aqueous medium: Highly efficient biginelli condensation procedure for the synthesis of 4-aryl-3,4-dihydropyrimidones

Novel nitration of estrone by metal nitrates

Dowex-promoted general synthesis of N,N′-disubstituted-4-aryl-3,4-dihydropyrimidinones using a solvent-free Biginelli condensation protocol

Corrigendum to “Stereoselective construction of the azabicyclic core applicable to the biologically important polyguanidinium alkaloids batzelladine A and D using a free radical cyclization”

Bioorganic & Medicinal Chemistry

Stereocontrolled synthesis of anticancer β-lactams via the Staudinger reaction

Microwave-induced bismuth nitrate-catalyzed synthesis of dihydropyrimidones via Biginelli condensation under solventless conditions

Journal	Data powered by TypesetTetrahedron Letters
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ISSN	0040-4039
Open Access	No