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Chemoselective synthesis of bis(indolyl)methanes using sulfonic acid-functionalized chitosan

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Herein, we describe the electrophilic substitution reaction of indole with aldehydes and ketone using sulphonic acid functional group containing chitosan for the synthesis of bis(indolyl)methanes. The reaction is chemoselective affording a product from aldehydes and indole. The catalyst can be reused up to three times without great loss in yields. Hence, chitosan–SO3H (CTSA) proved to be a heterogeneous, efficient, chemoselective, and reusable catalyst for the synthesis of bis(indolyl)methane derivatives.

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We are grateful to Dr. S.J.S. Flora Director, NIPER-Raebareli for their support and motivation. The authors Amit Kumar, Chetananda Patel, Pooja Patil and Shivam Vyas are thankful to Department of Pharmaceuticals, Ministry of Chemicals and Fertilizers, Government of India, for granting fellowship. SAIF-CSIR-CDRI, Lucknow, is greatly acknowledged for providing spectral data. NIPER-R/Communications/035.

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Correspondence to Abha Sharma.

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Kumar, A., Patel, C., Patil, P. et al. Chemoselective synthesis of bis(indolyl)methanes using sulfonic acid-functionalized chitosan. Chem. Pap. 73, 3095–3104 (2019). https://doi.org/10.1007/s11696-019-00846-2

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  • Bis(indolyl)methanes
  • Chemoselective
  • CTSA
  • Recyclable