Volume 57, Issue 44 pp. 14493-14497
Communication

Enantioselective Synthesis of the Spirotropanyl Oxindole Scaffold through Bimetallic Relay Catalysis

Dr. Zhi-Jun Jia

Dr. Zhi-Jun Jia

Max-Planck-Institut für Molekulare Physiologie, Abteilung Chemische Biologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany

Technische Universität Dortmund, Fakultät Chemie, Chemische Biologie, Chemische Biologie, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany

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Dr. Gang Shan

Dr. Gang Shan

Max-Planck-Institut für Molekulare Physiologie, Abteilung Chemische Biologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany

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Dr. Constantin G. Daniliuc

Dr. Constantin G. Daniliuc

Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149 Münster, Germany

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Dr. Andrey P. Antonchick

Corresponding Author

Dr. Andrey P. Antonchick

Max-Planck-Institut für Molekulare Physiologie, Abteilung Chemische Biologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany

Technische Universität Dortmund, Fakultät Chemie, Chemische Biologie, Chemische Biologie, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany

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Prof. Dr. Herbert Waldmann

Corresponding Author

Prof. Dr. Herbert Waldmann

Max-Planck-Institut für Molekulare Physiologie, Abteilung Chemische Biologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany

Technische Universität Dortmund, Fakultät Chemie, Chemische Biologie, Chemische Biologie, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany

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First published: 08 February 2018
Citations: 59

Graphical Abstract

Ring, ring: The first enantioselectively catalyzed synthesis of the spirotropanyl oxindole scaffold, which is characteristic of bioactive alkaloids like alstonisine and chitosenine, was developed. The method involves a bimetallic relay catalysis strategy, with a highly enantioselective 1,3-dipolar cycloaddition as the key step.

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.

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