CAS: 166021-01-8; (2R,3R,4R)-2-(((Triisopropylsilyl)Oxy)Methyl)-3,4-Dihydro-2H-Pyran-3,4-Diol

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21193-75-9 13265-84-4 137915-37-8

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triisopropylsilyl chloride D-galactal triacetyl-D-galactal 1,5-anhydro-6-O-triisopropylsilyl-3,4-O-carbonate-2-deoxy-D-lyxo-hex-1-enopyranose 3,4-di-O-benzyl-6-O-(triisopropylsilyl)-D-galactal 3)-6-O-(triisopropylsilyl)-D-galactalO-(2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl)-(1-3)-6-O-(triisopropylsilyl)-D-galactal 3)-6-O-(triisopropylsilyl)-D-galactalO-(2-O-acetyl-3,4,6-tri-O-benzyl-β-D-galactopyranosyl)-(1-3)-6-O-(triisopropylsilyl)-D-galactal

📜D-三乙酰半乳糖烯置于米帕明,氨体系中,用 甲醇,N,N-二甲基甲酰胺 用作溶剂,化学反应生成6-O-(三异丙基硅基)-D-半乳醛
参考文献:Synthesis Of Asialo Gm1. New Insights In The Application Of Sulfonamidoglycosylation In Oligosaccharide Assembly: Subtle Proximity Effects In The Stereochemical Governance Of Glycosidation
标题:Synthesis Of Asialo Gm1. New Insights In The Application Of Sulfonamidoglycosylation In Oligosaccharide Assembly: Subtle Proximity Effects In The Stereochemical Governance Of Glycosidation
摘要:The Total Synthesis Of Asialo Gm(1) (1A) Has Been Accomplished,Using Related Chemistry,The Methyl Glycoside Of The Asialo Compound (1B) Has Also Been Synthesized. These Kinds Of Compounds Have Been Identified As Potential Ligands For Bacterial And Viral Infection Sites,A Simpler Structure,Which Hits Also Been Identified For Its Infection Attracting Structure In The Context Of Glycopeptides And Glycolipids (Methyl Glycoside 2),Has Also Been Synthesized. The Key Common Phase In The Syntheses Involves The Sulfonamidoglycosidation Reaction Which Is Used To Create A Beta-Linkage Leading To A Galnac Residue Joined To The C-4 Hydroxyl Group Of A Galactose Unit Either As A Monosaccharide (See Compound 2) Or As C-4' In The Contest Of A Lactosyl Moiety,During The Course Of These Studies There Was Encountered An Unusual "Proximal Hydroxyl" Directing Effect. Thus,When C-4 On The Galactose Ring Of An Azaglycosylating Donor Bears A Free Hydroxyl (See,For Instance,Compound 13),Beta-Glycoside Formation Predominates. When This Hydroxyl Group Is Blocked,The Process Tends In The Direction Of Alpha-Glycoside Formation (See Compound 32),These Findings Were Explained As Arising From A Critical Intramolecular Hydrogen Bond Between The C-4 Axial Hydroxyl Of The Galactose Donor And Its Proximal Pyranosidal Ring Oxygen. This Interaction Stabilizes Conformations From Which Beta-Glycosidation Predominates.
Doi:10.1021/ja9724957