A new organic-inorganic hybrid catalyst (SMSNP-CA) was prepared by post synthesis grafting of -COOH functionalized organosilane on uniform spherical silica nanoparticles of 600 nm size with narrow slit like mesopores by using surface hydroxyl groups as anchor points. It was characterized by N 2 adsorption analysis, HRTEM, CHN analysis, 13 C CP MAS, 29 Si MAS NMR and FTIR spectroscopy. The nanosilica particles possess unique morphological features. The broad applicability of SMSNP-CA was probed through a library synthesis of highly decorated pyrroloacridinone derivatives in the eco-friendly solvent ethanol. CuI-catalyzed further C (sp 3 )-H oxyfunctionalization leading to CO formation was carried out using O 2 as an environmentally benign and ideal oxidant since water is the only byproduct in these reactions. This journal is © the Partner Organisations 2014.

CHHANDA MUKHOPADHYAY

Chemistry

S RAY

A BHAUMIK

M PRAMANIK

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

RSC Advances

A new facile and efficient one-pot three component approach for the preparation of 2, 3, 4-trisubstituted quinolines by (MCM-41)-pyridine catalyzed reaction of easily available substituted isatins and dialkylacetylenedicarboxylates in alcohol has been developed. The (MCM-41)-pyridine nanopowder catalyst has been synthesized and the catalyst has been carefully characterized by various techniques including FT-IR, XRD, HRTEM, EDS, N2-adsorption analysis etc. The materials obtained exhibit high surface area and a narrow distribution of mesoporosity. The key features of this methodology are mild reaction conditions, operational simplicity and facile product separation, high to excellent yields, as well as simple catalyst recovery and reusability. The most exciting feature of this cascade reaction is its mechanism involving the unusual ring opening of an isatin moiety, then recyclisation, aromatization followed by esterification. The synthesized substituted quinolines are expected to be used as lead compounds for the development of new drugs. © 2019 Wiley-VCH Verlag GmbH &amp; Co. KGaA, Weinheim

ChemistrySelect

Mesoporous MCM-41 Silica Supported Pyridine Nanoparticle: A Highly Efficient, Recyclable Catalyst for Expeditious Synthesis of Quinoline Derivatives through Domino Approach

An unprecedented product shape/size selectivity in the hydrolysis/decarboxylation reaction sequences of chromene with formic acid within MCM-41 as a nanoreactor in the liquid phase is observed. Chromene is expected to form pyrimidine in the reaction with HCOOH. However, here, serendipitously, the product switches from pyrimidine to enol lactones and δ-keto acids inside the nanoreactor. The shape/size selectivity in the liquid phase is a highly desired phenomenon in organic synthesis. We prepared four different varieties of porous silica materials to obtain this product selectivity. Very high yields of these biologically relevant compounds surpass that achieved by existing methodologies. Again, though there are few reports of coumarin-fused enol lactones, this approach enables the easy synthesis of naphthalene-fused enol lactones. Moreover, this is the first generalized synthesis of δ-keto acids following a number of hydrolysis/decarboxylation/ring opening/tautomerization/decarboxylation steps. © 2018 Wiley-VCH Verlag GmbH &amp; Co. KGaA, Weinheim

ChemCatChem

Serendipitous Observation of Liquid-Phase Size Selectivity inside a Mesoporous Silica Nanoreactor in the Reaction of Chromene with Formic Acid

Covalently anchored carboxylic acid on uniform spherical silica nanoparticles with narrow slit like mesopores for the synthesis of pyrroloacridinones: CuI-catalyzed further C(sp 3 )-H oxyfunctionalization for CO formation

Journal	RSC Advances
Publisher	-
ISSN	2046-2069
Open Access	No