Synlett 2009(7): 1141-1143  
DOI: 10.1055/s-0028-1088147
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Nonchiral-Pool Synthesis of (+)-Hyacinthacine B1

Paidi Venkatram Reddy, Peter Koos, Amaël Veyron, Andrew E. Greene, Philippe Delair*
Département de Chimie Moléculaire (SERCO) UMR-5250, ICMG FR-2607, CNRS Université Joseph Fourier, B. P. 53, 38041 Grenoble Cedex 9, France
Fax: +33(4)76635754; e-Mail: philippe.delair@ujf-grenoble.fr;
Further Information

Publication History

Received 18 November 2008
Publication Date:
20 March 2009 (online)

Abstract

The first nonchiral-pool total synthesis of (+)-hyacinthacine B1 has been achieved. The synthesis uses as key steps an efficient [2+2] cycloaddition of dichloroketene to a chiral enol ether, two diastereoselective Bruylants-like alkylations, and an effective double Tamao-Fleming oxidation.

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13

Both (R)- and (S)-Stericol® are now available from Sigma-Aldrich. (S)-Stericol® was chosen on the basis of previous work [8-¹0] that indicated it would lead to natural hyacinthacine B1.

14

The lactam was obtained as a 93:7 (¹H NMR) mixture of diastereomers. The minor enantiomer filtered out over the remainder of the synthesis.

23

The corresponding tetraacetates were also found to be identical by chromatography (TLC) in several different solvent systems and by ¹H and ¹³C NMR.