Synthesis 2017; 49(22): 4986-4995
DOI: 10.1055/s-0036-1590823
paper
© Georg Thieme Verlag Stuttgart · New York

Organocatalytic Asymmetric Synthesis of 2,3′-Connected Bis-Indolinones by Mannich Reactions of N-Acetylindolin-3-ones with Isatin N-Boc Ketimines

Authors

  • V. Pratap Reddy Gajulapalli

    a   Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
  • Ehsan Jafari

    a   Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
  • Dipti S. Kundu

    a   Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
  • Suruchi Mahajan

    a   Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
  • Anssi Peuronen

    b   Department of Chemistry, Nanoscience Center, University of Jyvaskyla, 40014 JYU, Finland   Email: enders@rwth-aachen.de
  • Kari Rissanen

    b   Department of Chemistry, Nanoscience Center, University of Jyvaskyla, 40014 JYU, Finland   Email: enders@rwth-aachen.de
  • Dieter Enders*

    a   Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
Further Information

Publication History

Received: 02 June 2017

Accepted: 06 June 2017

Publication Date:
01 August 2017 (online)


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Abstract

A highly diastereo- and enantioselective Mannich reaction of N-acetylindolin-3-ones with isatin N-Boc ketimines to form 2,3′-connected bis-indolinones is developed employing a low loading of a readily available bifunctional thiourea catalyst. The asymmetric synthesis connects two indolinones via a vic-diamine unit and generates two neighboring stereocenters.

Supporting Information