Enantioselective Synthesis of the Spirotropanyl Oxindole Scaffold through Bimetallic Relay Catalysis
- PMID: 29419912
- DOI: 10.1002/anie.201712882
Enantioselective Synthesis of the Spirotropanyl Oxindole Scaffold through Bimetallic Relay Catalysis
Abstract
Spirotropanyl oxindole alkaloids like alstonisine and chitosenine show a wide range of bioactivites. We report the first enantioselective synthesis of the spirotropanyl oxindole scaffold by means of a bimetallic relay catalysis strategy. A new class of E-oximino α-diazo ketones was developed for the intramolecular generation of transient azomethine ylides catalyzed by an achiral RhII complex and a subsequent intermolecular 1,3-dipolar cycloaddition catalyzed by a chiral N,N'-dioxide NdIII Lewis acid complex. The enantioselectively catalyzed transformation has broad scope and yields the desired spirotropanyl oxindole cycloadducts in high yields and with very high enantio- and diastereoselectivity.
Keywords: asymmetric synthesis; cycloaddition; oxindole alkaloids; relay catalysis; tropane.
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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