Morii Y, Matsuda H, Ohara K, Hashimoto M, Miyairi K, Okuno T. Synthetic studies on oligosaccharides composed of 5-thioglucopyranose units.
Bioorg Med Chem 2005;
13:5113-44. [PMID:
15982892 DOI:
10.1016/j.bmc.2005.05.028]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2005] [Revised: 05/17/2005] [Accepted: 05/17/2005] [Indexed: 11/20/2022]
Abstract
Glycosylation reactions of 5-thioglucopyranosyl trichloroacetimidates bearing ethereal protective groups at the 2-O-position 14-15, and 37 proceed smoothly to give alpha-glycosides stereoselectively by using a catalytic amount of silyl triflate. This methodology allowed us to achieve syntheses of sulfur-substituted isomaltotetraoside 2 and maltotetraoside 3. These studies also revealed that benzoyl-protected 5-thioglucopyranosyl trichloroacetimidate 12 underwent beta-selective glycosylation with C6-OH glucopyranosyl acceptors upon activation by BF3OEt2. This was applied for preparation of sulfur-substituted gentiobiosides 1 and 46.
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