Diastereoselective hydroboration of substituted exo-glucals revisited. A convenient route for the preparation of l-iduronic acid derivatives
作者:Laurence Rochepeau-Jobron、Jean-Claude Jacquinet
DOI:10.1016/s0008-6215(97)00149-3
日期:1997.10
isomer was then transformed in a straightforward manner into suitably protected l -iduronic acid glycosyl donors (chloride, bromide, trichloroacetimidate) which could serve as highly elaborated building blocks in syntheses of l -iduronic acid containing glycosaminoglycan fragments. An unexpected side-reaction occurring in the preparation of 1- O -trichloroacetimidoyl derivatives is also reported.
摘要将由3-O-苄基-d-吡喃葡萄糖容易地制得的,被适当保护的甲基3-O-苄基-6-脱氧-α-d-木糖-hex-5-enopyranoside衍生物与各种硼烷反应以制备相应的硼烷。 l-同剂量成分。甲基2-O-苯甲酰基-3-O-苄基-6-脱氧-4-O-叔丁基二甲基甲硅烷基-α-d-木糖-己基-5-烯吡喃糖苷与9-硼环[3.3.1]壬烷的反应(9 -BBN)提供易于分离的9:1 l-ido:d-葡萄糖混合物。然后将I-ido异构体以直接的方式转化成适当保护的I-艾杜糖醛酸糖基供体(氯化物,溴化物,三氯乙酰亚氨酸),其可以用作合成包含糖胺聚糖片段的I-艾杜糖醛酸的高度精细的结构单元。