Details of the Researcher

PHOTO

Das Biswajit
Section
Graduate School of Pharmaceutical Sciences
Job title
Specially Appointed Assistant Professor(Research)
e-Rad No.
91016021

Papers 5

  1. Organic Superbase t-Bu-P4 Catalyzed Concerted Nucleophilic Aromatic Substitution

    Ozora Sasamoto

    Organic Syntheses　2026

    DOI： 10.15227/orgsyn.103.0236 　

    ISSN： 2333-3553

  2. Sustainable Organic Photocatalysis for Site-Selective Hydrazocoupling of Electron-Rich Arenes

    Biswajit Das, Sushree Ranjan Sahoo, Amitabha Das, Biswarup Pathak, Debayan Sarkar

    Organic Letters　2023/10/27

    DOI： 10.1021/acs.orglett.3c03137 　

    ISSN： 1523-7060 1523-7052

  3. Temperature-Controlled Chemoselective Synthesis of Multisubstituted 4-Alkynyl/trans 4-Alkenyl Coumarins

    Sushree Ranjan Sahoo, Biswajit Das, Debayan Sarkar, Hans Reuter

    The Journal of Organic Chemistry　2022/11/04

    DOI： 10.1021/acs.joc.2c00994 　

    ISSN： 0022-3263 1520-6904

  4. Ruthenium (VIII) Catalysed Dearomative Pyridyl C−X Activation: Direct Synthesis of N‐ Alkyl‐2‐pyridones

    Biswajit Das, Nilendri Rout, Debayan Sarkar

    Asian Journal of Organic Chemistry　2021/07

    DOI： 10.1002/ajoc.202100258 　

    ISSN： 2193-5807 2193-5815

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    <jats:title>Abstract</jats:title><jats:p>An efficient synthetic strategy employing pyridyl C−X activation, for the generation of <jats:italic>N</jats:italic>‐alkyl‐2‐pyridones from <jats:italic>N</jats:italic>‐alkyl‐2‐halopyridinium salts is described. As pyridones are dearomatised synthetic derivatives of pyridines, a versatile scope exist for pyridyl C−H functionalisation. The present strategy exemplifies a straight forward in‐situ generation of Ru(VIII), leading catalytic dearomative synthesis of pyridones. The <jats:italic>N</jats:italic>‐alkyl‐2‐pyridones are further reduced to <jats:italic>N</jats:italic>‐alkyl‐2‐piperidones and a plausible mechanism is also drawn, which is supported by some controlled reactions.</jats:p>

  5. Visible Light Assisted Selenylative Intramolecular Dearomative Carbo‐Spirocyclisation (IDCS) of Homologated‐Ynones

    Sushree Ranjan Sahoo, Biswajit Das, Debayan Sarkar, F. Henkel, H. Reuter

    European Journal of Organic Chemistry　2020/02/21

    DOI： 10.1002/ejoc.201901821 　

    ISSN： 1434-193X 1099-0690

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    <jats:p>A visible light assisted dearomative selenylative carbo‐spirocyclisation of aromatic homologated‐ynones has been reported. The ynones deliver selenylative spiro‐cyclohexadienones and spiro‐diepoxides at varied temperatures. The prescribed methodology is photo‐catalyst free and scalable. The combination of visible light, molecular oxygen and the products synthesized delivers a uniqueness to the designed methodology.</jats:p>