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Synthesis 2011(2): 337-341
DOI: 10.1055/s-0030-1258369
DOI: 10.1055/s-0030-1258369
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
CeCl3˙7H2O: A Versatile and Efficient Reagent for the Synthesis of C-Pyrrolyl Glycosides
Further Information
Received
1 November 2010
Publication Date:
17 December 2010 (online)
Publication History
Publication Date:
17 December 2010 (online)

Abstract
1,3-Diketones and β-oxo esters undergo smooth coupling with d-glucosamine in the presence of 25 mol% CeCl3˙7H2O in water at 80 ˚C to furnish C-pyrrolyl glycosides in good to high yields. The reaction of cyclic diketones such as dimedone with d-glucosamine affords the corresponding 2-(3,4-dihydroxytetrahydrofuran-2-yl)-6,7-dihydro-1H-indol-4(5H)-one derivatives. These dihydroxy derivatives are directly converted into acetates using acetic anhydride and 4-(dimethylamino)pyridine. The use of readily available CeCl3˙7H2O makes this procedure quite simple, convenient and practical.
Key words
C-pyrrolyl glycosides - 1,3-diones - glucosamine - cerium(III) salts
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