Conjugate Addition of 2-Acetylindole Enolates to UnsaturatedOxazolopiperidone Lactams: Enantioselective Access to the Tetracyclic RingSystem of Ervitsine

Fecha de publicación

2020-11-04T10:09:21Z

2020-11-04T10:09:21Z

2011

2020-11-04T10:09:21Z

Resumen

The stereochemical outcome of the conjugate addition reactions of 2-acetylindole enolates to unsaturated phenylglycinol-derived oxazolopiperidone lactams 1a-f is studied. After reduction of the 2-acylindole carbonyl group, the Michael adduct cis-6 underwent a Lewis acid-promoted intramolecular α-amidoalkylation, enantioselectively leading to the tetracyclic ring system of the indole alkaloid ervitsine Keywords: Lactams / Asymmetric synthesis / Cyclization / Michael addition / Heterocycles

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Wiley-VCH

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Versió postprint del document publicat a:

European Journal of Organic Chemistry, 2011, p. 898-907

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(c) Wiley-VCH, 2011