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Goreti Ribeiro Morais 《Tetrahedron letters》2007,48(43):7637-7641
Methodology for the efficient and facile synthesis of glycosyl disulfides is reported. A one-pot procedure employing mild conditions using diethyl azodicarboxylate is described to synthesise a series of glycosyl disulfides in excellent yields. 相似文献
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An eco-friendly reaction for the preparation of thioglycosides has been developed using an ionic liquid as the solvent. Thioglycosides were obtained in excellent yields on treatment of per-O-acetylated sugar derivatives with thiols in the presence of boron trifluoride diethyl etherate in [Bmim][BF4] as solvent at 20°C. Supplemental materials are available for this article. Go to the publisher's online edition of Journal of Carbohydrate Chemistry to view the free supplemental file. 相似文献
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《Journal of carbohydrate chemistry》2013,32(4-6):503-516
The activation of 2‐azido‐2‐deoxy Tn and TF thioglycosyl donors by the powerful thiophilic promoter system Ph2SO/Tf2O has been investigated. Glycosylation of an Fmoc‐protected threonine derivative gave 1,2‐cis glycosides in high yields and excellent stereoselectivities. The galactosylation of phenyl 2‐azido‐4,6‐O‐benzylidene‐2‐deoxy‐1‐thio‐β‐D‐galactopyranoside was achieved in high yield and without orthoester formation using a trichloroacetimidate donor carrying a 2‐O‐(2,5‐difluorobenzoyl) group. The anomeric thiophenyl group of the constructed TF disaccharide could directly be activated by the van Boom promotor for the glycosylation of a threonine derivative. 相似文献
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An antimetastatic tetrasaccharide T1,β-D-Gal-(1→4)-β-D-GlcpNAc-(1→6)-α-D-Manp-(1→6)-β-D-Manp-OMe,was synthesized with two approaches.The first approach was a conventional method employing thioglycoside and Koenigs-Knorr glycosylation reaction in 24%overall yield.The second one was a novel route through the azidoiodo-glycosylation strategy by using 2-iodo-2-deoxylactosyl azide as the donor in 36%overall yield. 相似文献
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High yielding synthesis of six- and five-membered N-substituted iminosugar glycosides and of five-membered iminosugar thioglycosides by nucleophilic opening of both new and previously described N-diethoxycarbonylvinyl anhydroiminosugar derivatives (glycosyl donors) with primary alcohols, primary thiols, and thiophenol (glycosyl acceptors) is reported. The reactions are highly stereoselective, with anomeric ratios better than 4:1. 相似文献