Synthesis 2021; 53(14): 2485-2493
DOI: 10.1055/a-1430-5100
paper

Sulfur-Promoted Redox Cyclization of 2,2′-Dinitrodiphenyl Disulfides and Benzylamines

Authors

  • Masahiro Teramoto

    a   Seika Corporation, 1660-627 Nishihama, Wakayama 641-0036, Japan
    b   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
  • Mitsutaka Imoto

    a   Seika Corporation, 1660-627 Nishihama, Wakayama 641-0036, Japan
  • Motonori Takeda

    a   Seika Corporation, 1660-627 Nishihama, Wakayama 641-0036, Japan
  • Takumi Mizuno

    a   Seika Corporation, 1660-627 Nishihama, Wakayama 641-0036, Japan
  • Akihiro Nomoto

    b   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
  • Akiya Ogawa

    b   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan


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Abstract

This study aims to develop green and sustainable advanced synthetic methods based on redox cyclization. Elemental sulfur is shown to promote the efficient synthesis of 2-substituted benzothiazoles from 2,2′-dinitrodiphenyl disulfides and benzylamines via redox cyclization in the absence of transition-metal catalysts and solvents. The 2-substituted benzothiazoles are obtained in good to excellent yields. This synthetic methodology is highly atom-economical and does not require any external oxidizing and/or reducing agents.

Supporting Information



Publication History

Received: 20 February 2021

Accepted after revision: 12 March 2021

Accepted Manuscript online:
12 March 2021

Article published online:
01 April 2021

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