Cheshev P, Marra A, Dondoni A. Direct epoxidation of d-glucal and d-galactal derivatives with in situ generated DMDO.
Carbohydr Res 2006;
341:2714-6. [PMID:
17014831 DOI:
10.1016/j.carres.2006.09.003]
[Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2006] [Revised: 08/31/2006] [Accepted: 09/03/2006] [Indexed: 11/28/2022]
Abstract
A multi-gram epoxidation of 3,4,6-tri-O-benzyl-D-glucal and D-galactal with dimethyldioxirane (DMDO) generated in situ from Oxone/acetone in a biphasic system (CH(2)Cl(2)-aqueous NaHCO(3)) resulted in the formation of the corresponding 1,2-anhydrosugars in a 99% yield and 100% selectivity. In a similar way, 3,4,6-tri-O-acetyl-D-glucal afforded a 7:1 mixture of the corresponding gluco and manno derivatives in an 87% overall yield.
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