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Issue 7, 2019
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Formal [4 + 2] benzannulation of 2-alkenyl indoles with aldehydes: a route to structurally diverse carbazoles and bis-carbazoles

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Abstract

Construction of structurally diverse carbazoles and bis-carbazoles by protecting-group-free formal [4 + 2]-benzannulation of 2-alkenyl indoles and aldehydes is demonstrated. The sequence of four different reactions is executed in one-pot using readily available and cheap bottle reagents as catalysts rendering this method attractive. The incorporation of inexpensive and environmentally benign molecular oxygen as the oxidant into the final aromatization step enables tolerance of several functional groups.

Graphical abstract: Formal [4 + 2] benzannulation of 2-alkenyl indoles with aldehydes: a route to structurally diverse carbazoles and bis-carbazoles

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Publication details

The article was received on 17 Nov 2018, accepted on 10 Dec 2018 and first published on 10 Dec 2018


Article type: Communication
DOI: 10.1039/C8OB02875C
Citation: Org. Biomol. Chem., 2019,17, 1822-1826

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    Formal [4 + 2] benzannulation of 2-alkenyl indoles with aldehydes: a route to structurally diverse carbazoles and bis-carbazoles

    A. Banerjee, A. Guin, S. Saha, A. Mondal and M. S. Maji, Org. Biomol. Chem., 2019, 17, 1822
    DOI: 10.1039/C8OB02875C

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