An efficient and eco-friendly method for the synthesis of spirooxindoles with fused tetrahydrochromenes has been demonstrated using basic nanocrystalline MgO catalyst in aqueous condition. The method has been applied for the synthesis of a range of compounds with variable functionalities in excellent yield and selectivity. © 2012 Elsevier Ltd. All rights reserved.

B KARMAKAR

A NAYAK

J BANERJI

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

The high surface area three-dimensional porous catalyst has been prepared and characterized by TEM, BET S.A, low angle XRD, 29Si MAS NMR, NH3 TPD techniques. A simple, efficient and rapid method for the green synthesis of α-aminonitriles has been demonstrated over a new mesoporous gallosilicate catalyst Ga-TUD-1. The solventless technique has been applied for the synthesis of a range of compounds with variable functionality with excellent yield and selectivity. The catalyst has been recycled four times with reproducible yield. © 2010 Elsevier B.V. All rights reserved.

Applied Catalysis A: General

Ga-TUD-1: A new heterogeneous mesoporous catalyst for the solventless expeditious synthesis of Î±-aminonitriles

Highly thermally stable three-dimensional spongelike mesoporous CexZr1-xO2 solid solutions consisting of nanometer size particles with different Ce/Zr compositions were synthesized by a modified sol-gel procedure using a triethanolamine/water mixture as a solvent to be used in liquid Knoevenagel condensation reaction. These materials were investigated in detail by means of X-ray diffraction (XRD), Raman spectroscopy, chemical analysis, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and adsorption microcalorimetry. The XRD, HRTEM and XPS studies proved the presence of nanocrystalline CexZr1-xO2 solid solutions. These solid solutions showed excellent chemoselectivity in the classical Knoevenagel reaction. The large pore sizes (around 10 nm) highlight the possibility of using CexZr1-xO2 as a support material for versatile catalytic systems. The results obtained from NH3 and SO2 adsorption microcalorimetry experiments successfully demonstrated the incorporation of ZrO2 into the CeO2 lattice resulting in both acidic and basic surface sites in a mixed oxide matrix. © 2009 Elsevier Inc. All rights reserved.

Journal of Catalysis

Knoevenagel condensation reaction over acid-base bifunctional nanocrystalline CexZr1-xO2 solid solutions

Ciência e Natura

Synthesis of spirooxindoles with three component reaction between β-ketoesters, malononitrile and isatin derivatives in the presence of Alum.SiO2 nanoparticles as a new nano catalyst

Green Chemistry

Step-economic, efficient, ZnS nanoparticle-catalyzed synthesis of spirooxindole derivatives in aqueous medium via Knoevenagel condensation followed by Michael addition

Tetrahedron

Electrocatalytic multicomponent transformation of cyclic 1,3-diketones, isatins, and malononitrile: facile and convenient way to functionalized spirocyclic (5,6,7,8-tetrahydro-4H-chromene)-4,3′-oxindole system

A clean and expedient synthesis of spirooxindoles in aqueous media catalyzed over nanocrystalline MgO

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ISSN	0040-4039