4.8 Article

Enantioselective (4+2) Annulation of Donor-Acceptor Cyclobutanes by N-Heterocyclic Carbene Catalysis

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 52, Pages 16136-16140

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201609330

Keywords

cyclohexanes; donor-acceptor cyclobutanes; enantioselective catalysis; N-heterocyclic carbenes; organocatalysis

Funding

  1. Australian Research Council [DP150101522, FT110100319]
  2. Australian Research Council [FT110100319] Funding Source: Australian Research Council

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Herein we report the enantioselective (4+2) annulation of donor-acceptor cyclobutanes and unsaturated acyl fluorides using N-heterocyclic carbene catalysis. The reaction allows a 3-step synthesis of cyclohexyl -lactones (25 examples) in excellent chemical yield (most 90%) and stereochemical integrity (all >20:1 d.r., most 97:3 e.r.). Mechanistic studies support ester enolate Claisen rearrangement, while derivatizations provide functionalized cyclohexenes and dihydroquinolinones.

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