Synthesis of fragments of the capsular polysaccharide of Haemophilus influenzae type b: Part I. Preparation of suitably protected 1-O-β-D-ribofuranosyl-D-ribitol building blocks
作者:J. P. G. Hermans、L. Poot、G. A. van der Marel、P. Hoogerhout、M. Kloosterman、J. H. van Boom、C. A. A. van Boeckel、D. Evenberg、J. T. Poolman
DOI:10.1002/recl.19871060905
日期:——
The synthesis of the protected ribosylribitol derivatives 15 and 17, which are building blocks for the preparation of fragments of the H. influenzae type b polysaccharide, is presented. Starting from D-ribonolactone (1), 5-O-allyl-2,3,4-tri-O-benzyl-D-ribitol (8) was prepared in seven steps (Scheme 1). Coupling of 8 with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose (9) in the presence of trimethylsilyl
提出了被保护的核糖核糖醇衍生物15和17的合成,它们是制备流感嗜血杆菌b型多糖片段的基础。从开始d -ribonolactone(1),5-O-烯丙基-2,3,4-三ö苄基d -ribitol(8)中的溶液在七个步骤(方案1)制备。在三甲基甲硅烷基三氟甲磺酸酯存在下,将8与1- O-乙酰基-2,3,5-三-O-苯甲酰基-β - D-呋喃呋喃糖偶联(9)得到核糖基核糖醇衍生物10(方案2),将其脱苯甲酰化得到化合物11。用1,1,3,3-四异丙基二硅氧烷-1,3保护11的核糖部分的C-3'-和C-5'-羟基官能团-二基和C-2'位置具有苄氧基甲基。化合物13如此获得的转化为其5- ö -反式-1-丙烯基异构体14。