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CC BY ND NC 4.0 · SynOpen 2018; 02(02): 0138-0144
DOI: 10.1055/s-0036-1591572
paper
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Efficient Syntheses of Diverse N-Heterocycles: The Molybdenum(VI)-Catalyzed Reductive Cyclization of Nitroarenes using Pinacol as a Deoxygenating­ Agent

Authors

  • Raghuram Gujjarappa

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in
  • Nagaraju Vodnala

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in
  • Arup K. Kabi

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in
  • Dhananjaya Kaldhi

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in
  • Mohan Kumar

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in
  • Uwe Beifuss

    b   Institut für Chemie, Universität Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany
  • Chandi C. Malakar  *

    a   Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal-795004, Manipur, India   Email: cmalakar@nitmanipur.ac.in

C.C.M. acknowledges Science and Engineering Research Board (SERB), New Delhi and NIT Manipur for the financial support in the form of research grant (ECR/2016/000337). R.G., N.V., D.K. and A.K.K. are grateful to the Ministry of Human Resource and Development (MHRD), New Delhi for Fellowship support.
Further Information

Publication History

Received: 31 January 2018

Accepted after revision: 05 April 2018

Publication Date:
09 May 2018 (online)


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Abstract

Molybdenum(VI)-catalyzed domino reductive cyclization of nitroarenes has been devised for the syntheses of 1,4-benzoxazines and 1,4-benzothiazines in the presence of pinacol as deoxygenating agent. The scope of the described method was further extended to the syntheses of the rarely explored scaffolds, 1-hydroxyphenazines and quinoxalines. The present method avoids the use of hazardous deoxygenating agents and operates under solvent-free conditions.

Supporting Information