Sato S, Naito Y, Aoki K. Scandium cation-exchanged montmorillonite catalyzed direct C-glycosylation of a 1,3-diketone, dimedone, with unprotected sugars in aqueous solution.
Carbohydr Res 2007;
342:913-8. [PMID:
17306239 DOI:
10.1016/j.carres.2007.01.013]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Revised: 01/19/2007] [Accepted: 01/23/2007] [Indexed: 11/25/2022]
Abstract
The condensation of dimedone with unprotected sugars in aqueous solution in the presence of a catalytic amount of Sc(3+)-montmorillonite (Sc(3+)-mont) gave 9-hydroxyalkyl-3,3,6,6,-tetramethyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-diones in good yields, while the use of Sc(OTf)(3) instead of Sc(3+)-mont gave the hydroxyalkyl-6,7-dihydrobenzofuran-4(5H)-one derivatives in good yields. Furthermore, Sc(3+)-mont could be recycled without inactivation.
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