CC BY-ND-NC 4.0 · Synthesis 2019; 51(05): 1123-1134
DOI: 10.1055/s-0037-1610409
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Asymmetric Organocatalysis Revisited: Taming Hydrindanes with Jørgensen–Hayashi Catalyst

Yannick Stöckl
,
Wolfgang Frey
,
Johannes Lang
,
Birgit Claasen
,
Angelika Baro
,
Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany   Email: sabine.laschat@oc.uni-stuttgart.de
› Author Affiliations
Generous financial support by the Ministerium für Wissenschaft, Forschung und Kunst des Landes Baden-Württemberg, the Fonds der Chemischen Industrie, the Deutsche Forschungsgemeinschaft (shared instrumentation grant INST 41/897-1 FUGG for 700 MHz NMR) and the DAAD (DAAD-RISE fellowship for Y.S.) is gratefully acknowledged. J. L. would like to thank support by the state of Baden-Württemberg through bwHPC and the Deutsche Forschungsgemeinschaft through grant no. INST 40/467-1 FUGG (JUSTUS cluster).
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Publication History

Received: 12 November 2018

Accepted: 15 November 2018

Publication Date:
14 December 2018 (online)


Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue

Abstract

The organocatalytic Michael reaction of easily available 1-cyclopentene-1-carbaldehyde and 1,3-dicarbonyl compounds led to cyclopentanecarbaldehydes on a gram scale with low catalyst loading (2 mol%) and high enantioselectivity. The synthetic potential of 4-acylhexahydroindenones from intramolecular aldol condensation was demonstrated by Diels–Alder reaction to a tetracyclic derivative with seven stereogenic centers. The diastereofacial preference of the tetracyclic product was confirmed by DFT calculations. The described reaction sequence is characterized by few redox-economic steps and high degree of molecular complexity.

Supporting Information