Volume 60, Issue 16 pp. 8808-8812
Communication

Unprecedented Reactivity of γ-Amino Cyclopentenone Enables Diversity-Oriented Access to Functionalized Indoles and Indole-Annulated Ring Structures

Chenna Jagadeesh

Chenna Jagadeesh

Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014 Uttar Pradesh, India

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Biplab Mondal

Biplab Mondal

Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014 Uttar Pradesh, India

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Sourav Pramanik

Sourav Pramanik

Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014 Uttar Pradesh, India

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Prof. Dr. Dinabandhu Das

Prof. Dr. Dinabandhu Das

School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India

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Prof. Dr. Jaideep Saha

Corresponding Author

Prof. Dr. Jaideep Saha

Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014 Uttar Pradesh, India

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First published: 01 February 2021
Citations: 23

Graphical Abstract

This work highlights diversity-oriented access to cyclopentenoid indoles and indole-alkaloid like structures which is pillared on an unprecedented latent reactivity of γ-aminoenones. The transformation highlights γ- or β,γ-functionalization of enones to generate new structural space. A reverse-aza-Piancatelli rearrangement seemed to be operating, which should invoke new attributes to its mechanism.

Abstract

Observation of an unexpected, Lewis acid promoted displacement of latent reactive γ-amino group on cyclopentenone presented unparalleled opportunity for enone functionalization and annulations with indole derivatives, which is developed in the current study. Herein, a vast range of C3/N-indolyl enones and indole alkaloid-like compound were accessed in excellent yields (up to 99 %) and selectivity through a one-pot operation. The mechanism most likely involves an unprecedented trait of Piancatelli-type rearrangement where influence of the gem-diaryl group appeared crucial.

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