Sulakshana Karmakar

Bose Institute

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Manas Chakrabarty

Bose Institute

Yoshihiro Harigaya

Tripura University

Shiho Arima

Kagoshima University

Ajanta Mukherji

Bose Institute

Ratna Mukherjee

Bose Institute

Peter H. Seeberger

Max Planck Institute of Colloids and Interfaces

Athina Geronikaki

Aristotle University of Thessaloniki

Kenichiro Nagai

Kitasato University

Pitta Eleni

Aristotle University of Thessaloniki

Cooperative Institutions

Bose Institute

Kitasato University

Kitasato Institute Hospital

Aristotle University of Thessaloniki

Max Planck Institute of Colloids and Interfaces

Freie Universität Berlin

Max Planck Society

Max Planck Institute of Molecular Plant Physiology

University of Connecticut

CIC bioGUNE

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Tosic Acid-on-Silica Gel: A Cheap and Eco-friendly Catalyst for a Convenient One-pot Synthesis of Substituted Benzimidazoles

Monatshefte für Chemie - Chemical Monthly (2007)

Manas Chakrabarty Ratna Mukherjee Sulakshana Karmakar Yoshihiro Harigaya

Environmentally Friendly

10.1007/s00706-007-0714-2

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Citations (39)

One-Pot Formation of Functionalised 2-Piperidinones from Arylidenecyanoacetates and Methanolic Ammonia via Tandem Reactions

Heterocycles (2007)

Manas Chakrabarty Sulakshana Karmakar Shiho Arima Yoshihiro Harigaya

Aryl aldehydes react with ethyl cyanoacetate in methanolic ammonium acetate to expeditiously furnish, besides high yields of arylidenecyanoacetates, 4,6-diaryl-3,5-dicyano-5-ethoxycarbonyl-2-piperidinones in low yields. But preformed arylidenecyanoacetates react with methanolic ammonia to furnish the same functionalised 2-piperidinones in much better yields. The actual stereostructure of one of the products was determined by single crystal X-ray diffraction analysis, and novel tandem reactions occurring in one pot are proposed for the formation of the products.

Tandem

10.3987/com-07-s(u)59

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Citations (7)

ChemInform Abstract: Tosic Acid‐on‐Silica Gel: A Cheap and Eco‐Friendly Catalyst for a Convenient One‐Pot Synthesis of Substituted Benzimidazoles.

ChemInform (2008)

Manas Chakrabarty Ratna Mukherjee Sulakshana Karmakar Yoshihiro Harigaya

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Environmentally Friendly

10.1002/chin.200809135

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Application of Sulfamic Acid as an Eco‐Friendly Catalyst in an Expedient Synthesis of Benzimidazoles.

ChemInform (2006)

Manas Chakrabarty Sulakshana Karmakar Ajanta Mukherji Shiho Arima Yoshihiro Harigaya

Sulfamic acid

Environmentally Friendly

10.1002/chin.200640124

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Citations (6)

ChemInform Abstract: One‐Pot Formation of Functionalized 2‐Piperidinones from Arylidenecyanoacetates and Methanolic Ammonia via Tandem Reactions.

ChemInform (2008)

Manas Chakrabarty Sulakshana Karmakar Shiho Arima Yoshihiro Harigaya

Tandem

10.1002/chin.200818136

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Citations (0)

Application of Sulfamic Acid as an Eco-friendly Catalyst in an Expedient Synthesis of Benzimidazoles

Heterocycles (2006)

Peter H. Seeberger Manas Chakrabarty Sulakshana Karmakar Ajanta Mukherji Shiho Arima

Sulfamic acid, an eco-friendly and zwitterionic solid, proved to be a very efficient catalyst for the reaction of ortho-phenylenediamine with aryl aldehydes in ethanol at room temperature to furnish both 1-arylmethyl-2-aryl-and 2-arylbenzimidazoles in very good to excellent overall yields.

Sulfamic acid

Environmentally Friendly

Solid acid

10.3987/com-06-10692

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Citations (82)

A New Catalytic Application of a Keggin Acid in the Synthesis of Symmetrical Bis(indolyl)alkanes.

ChemInform (2006)

Manas Chakrabarty Ajanta Mukherji Sulakshana Karmakar Shiho Arima Yoshihiro Harigaya

10.1002/chin.200624119

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First Isolation of Both Indolylcarbinols and Diindolylalkanes from Microwave‐Assisted Acid (Clay)‐Catalyzed Reaction of Indoles with Diethyl Ketomalonate.

ChemInform (2005)

Manas Chakrabarty Sulakshana Karmakar Yoshihiro Harigaya

Abstract For Abstract see ChemInform Abstract in Full Text.

Isolation

10.1002/chin.200521121

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Citations (1)

An expedient synthesis of novel 2-substituted thiazolo[4,5-f]isoquinolines/quinolines and benzo[1,2-d:4,3-d']bisthiazoles and their potential as inhibitors of COX-1 and COX-2

ARKIVOC (2010)

Manas Chakrabarty Ajanta Mukherji Sulakshana Karmakar Ratna Mukherjee Kenichiro Nagai

An efficient, general synthesis of 2-substituted thiazolo[4,5-f]isoquinolines, thiazolo[4,5-f]quinolines and benzo [1,2-d:4,3-d′]bisthiazoles has been accomplished from 5nitroisoquinoline/quinoline and 6-nitrobenzothiazole, respectively, and all the products have been thoroughly identified spectroscopically (IR, 1 H and 13 C NMR, LR/ HR EI/ FAB/ ESI-MS).The synthesis of thiazolo [4,5-f]isoquinolines constitutes the first synthesis of this class of heteroarenes.Eighteen compounds, covering all three types, were screened for inhibition of COX-1 and COX-2, and some of them showed moderate activities.

10.3998/ark.5550190.0011.b22

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Citations (11)

Reaction of diethyl mesoxalate with active methylene compounds : an interesting outcome

Zenodo (CERN European Organization for Nuclear Research) (2008)

Sulakshana Karmakar Manas Chakrabarty

Diethyl mesoxalate reacts separately with each of Meldrum's acid, indan-1,3-dione and diethyl malonate-all active methylene compounds - on neutral alumina either at room temperature or under microwave irradiation to furnish expeditiously the corresponding tertiary carbinols in very good yields. However, when the reaction of diethyl mesoxalate with a number of other active methylene compounds was tried similarly or by heating at 60-70 °C, the reactions either led to single products, which were too unstable to be isolated, or simply failed. Our findings, shedding new light on the reactivity of diethyl mesoxalate, are presented below.

Methylene

10.5281/zenodo.5808975

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Citations (1)