کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5226732 | 1383584 | 2009 | 7 صفحه PDF | دانلود رایگان |
1,3-Di-O-acetyl-4-O-benzyl-2,6-dideoxy-d-arabinopyranose (11) was synthesised from thiophenyl α-d-mannopyranoside (21) in an eight-step sequence. Tosylation of 21 and subsequent reaction with 2,2-dimethoxypropane gave tosylate 22, which upon treatment with lithium aluminium hydride furnished 6-deoxy glycoside 24 and by-product thiophenyl 6-deoxy-2-O-isopropyl-α-d-arabinopyranoside. The X-ray crystal structure of the latter was determined. Benzylation of the 4-hydroxyl group of 24 and subsequent protecting group manipulation gave d-rhamnosyl bromide 29, which on treatment with zinc–copper couple gave the orthogonally protected d-rhamnal 30. Triphenylphosphine hydrogen bromide catalysed addition of acetic acid to 30 furnished the target molecule 11. The scandium(III) triflate promoted reaction of 11 and 2-naphthol gave the corresponding C-glycoside 36 in 86% yield.
Differentially protected 2,6-dideoxyglycosyl donor 11 was synthesized from thiophenyl α-d-mannopyranoside (21) in an eight-step sequence. Its Sc(OTf)3 catalysed reaction with 2-naphthol gave β-C-glycoside 36 in 86% yield.Figure optionsDownload as PowerPoint slide
Journal: Tetrahedron - Volume 65, Issue 21, 23 May 2009, Pages 4092–4098