Synthesis 2004(18): 3047-3054  
DOI: 10.1055/s-2004-834904
PAPER
© Georg Thieme Verlag Stuttgart · New York

Diastereoselective Synthesis of 2,5-Disubstituted Decahydroquinolines via Ring-Rearrangement Metathesis and Zirconium-Mediated Cyclization

Jürgen Neidhöfer, Siegfried Blechert*
Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany
Fax: +49(30)31423619; e-Mail: blechert@chem.tu-berlin.de;
Further Information

Publication History

Received 2 June 2004
Publication Date:
02 November 2004 (online)

Abstract

A diastereoselective approach to 2,5-substituted decahydroquinolines by zirconium-mediated cyclization of unsaturated α,α′-disubstituted piperidines II is described. The required piperidines could be obtained from secondary sulfonamides III via ruthenium-catalyzed ring-rearrangement metathesis (RRM) in high yields. Racemic trans-195A and 2-epi-trans-195A were synthesized in 8 steps starting with butyraldehyde and cyclohex-2-enol.

15

Absolute configuration not known.

20

Crystallographic data for both structures have been deposited with the Cambridge Crystallographic Data Centre under the depository numbers.: CCDC-239791 (1), CCDC-239792 (16).