Synlett 2005(3): 520-522  
DOI: 10.1055/s-2005-862364
LETTER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Methylene Exoglycals Using a Modified Julia Olefination

David Gueyrard*, Rose Haddoub, Amine Salem, Nassib Said Bacar, Peter G. Goekjian
UMR 5181, Laboratoire de Chimie Organique 2 - Glycochimie, Université Claude Bernard Lyon 1, CNRS, 43, Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
Fax: +33(4)72448349; e-Mail: david.gueyrard@univ-lyon1.fr;
Further Information

Publication History

Received 29 November 2004
Publication Date:
04 February 2005 (online)

Abstract

A new route to exomethylene sugars is reported. The use of a two-step coupling-elimination procedure allows successful Julia olefination of sugar-derived lactones.

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All compounds were characterised by NMR spectroscopy and HRMS. Data were identical to those reported in the literature.
Data for compound 5: 1H NMR (300 MHz, CDCl3): δ = 4.39 (d, 1 H, J = 4.3 Hz, H-2), 4.23 (s, 1 H, H-1′a), 4.05 (m, 2 H, H-3 and H-4), 3.95 (s, 1 H, H-1′b), 3.71 (dd, 1 H, J = 3.2 Hz, J = 11.5 Hz, H-5a), 3.63 (dd, 1 H, J = 3.4 Hz, H-5b), 0.90 (m, 27 H, CH3), 0.59 (m, 18 H, CH2). 13C NMR (75 MHz, CDCl3): δ = 4.7, 5.2, 5.5, 7.1, 7.2, 7.3, 62.4, 72.7, 73.0, 82.6, 85.9, 163.4. IR: 1678 cm-1 (C=C). [α]D +15 (c 1, CHCl3). HRMS (CI-MS): m/z calcd for C24H52O4Si3 [M + H]+: 489.3252; found: 489.3257