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Bhawana Singh

Banaras Hindu University

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Publication

Featured researches published by Bhawana Singh.

Journal of Organic Chemistry | 2009

Copper-free palladium-catalyzed Sonogashira coupling-annulation: efficient one-pot synthesis of functionalized pyrano[4,3-b]quinolines from 2-chloro-3-formylquinolines.

Atish Chandra; Bhawana Singh; Ranjana S. Khanna; Radhey M. Singh

A convenient, one-pot, copper-free, Pd-catalyzed methodology has been described for the synthesis of 1,3-disubstituted pyrano[4,3-b]quinolines from 2-chloro-3-formylquinolines. Formation of annulated products 3 is attributed to the presence of Pd(OAc)2 and PPh3. Further, PPh3 in the reaction mixture promotes the cyclization by reducing the reaction time and increasing the yield of cyclized product.

Tetrahedron | 2008

Copper-free Sonogashira coupling of 2-chloroquinolines with phenyl acetylene and quick annulation to benzo[b][1,6]naphthyridine derivatives in aqueous ammonia

Atish Chandra; Bhawana Singh; Shraddha Upadhyay; Radhey M. Singh

Tetrahedron Letters | 2007

Synthesis of diastereomeric 2,4-disubstituted pyrano[2,3-b]quinolines from 3-formyl-2-quinolones through O–C bond formation via intramolecular electrophilic cyclization

M. Singh; Atish Chandra; Bhawana Singh; Radhey M. Singh

Tetrahedron | 2011

Base-free NIS promoted electrophilic cyclization of alkynes: an efficient synthesis of iodo substituted pyrano[4,3-b]quinolines

Bhawana Singh; Atish Chandra; Seema Singh; Radhey M. Singh

Tetrahedron | 2011

Base-free amination of BH acetates of 2-chloroquinolinyl-3-carboxaldehydes: a facile route to the synthesis of N-substituted-1,2-dihydrobenzo[b][1,8]-naphthyridines

Bhawana Singh; Atish Chandra; Radhey M. Singh

Tetrahedron Letters | 2008

Electrophile-induced domino cyclization reaction for the synthesis of 2,2a,10,11 -tetrahydrofuro[2',4':4,6]pyrano[2,3-b]quinolines

Bhawana Singh; Atish Chandra; Shraddha Upadhyay; Radhey M. Singh; M.C. Puerta; Pedro Valerga

Tetrahedron Letters | 2012

Rapid, clean and efficient one-pot synthesis of thiopyrano[2,3-b]quinolines via domino Michael addition/cyclization reactions

Bhawana Singh; Atish Chandra; Mrityunjaya Asthana; Radhey M. Singh

Tetrahedron | 2011

Base-catalyzed cyclization reaction of 2-chloroquinoline-3-carbonitriles and guanidine hydrochloride: a rapid synthesis of 2-amino-3H-pyrimido[4,5-b]quinolin-4-ones

Atish Chandra; Shraddha Upadhyay; Bhawana Singh; Neha Sharma; Radhey M. Singh

Tetrahedron | 2012

Ligand promoted and controlled palladium-catalyzed intramolecular Heck reaction of homoallyl alcohols: a facile synthesis of cyclopentaannulated quinolines

Radhey M. Singh; Atish Chandra; Neha Sharma; Bhawana Singh; Ritush Kumar

Chemical Communications | 2017

p-Selective (sp2)-C–H functionalization for an acylation/alkylation reaction using organic photoredox catalysis

Ganesh Pandey; Sandip Kumar Tiwari; Bhawana Singh; Kumar Vanka; Shailja Jain

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Collaboration

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Atish Chandra

Banaras Hindu University

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Radhey M. Singh

Banaras Hindu University

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A. K. Srivastav

Banaras Hindu University

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Shraddha Upadhyay

Banaras Hindu University

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Ganesh Pandey

Allahabad University

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M. Singh

Banaras Hindu University

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Neha Sharma

Banaras Hindu University

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Kumar Vanka

Council of Scientific and Industrial Research

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Mrityunjaya Asthana

Banaras Hindu University

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P. K. Singh

Banaras Hindu University

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