Process for recovery of the desired cis-1,3-oxathiolane nucleosides from their undesired trans-isomers
    2.
    发明授权
    Process for recovery of the desired cis-1,3-oxathiolane nucleosides from their undesired trans-isomers 失效
    从所需的反式异构体中回收所需的顺式-1,3-氧硫杂环戊烷核苷的方法

    公开(公告)号:US06600044B2

    公开(公告)日:2003-07-29

    申请号:US09881705

    申请日:2001-06-18

    IPC分类号: C07D41104

    CPC分类号: C07D411/04

    摘要: A process for the preparation of 1,3-oxathiolane nucleoside analogues in predominantly the cis-form, from mixture of cis-/trans-1,3-oxathiolane nucleosides or their protected derivatives thereof, comprising: (i) treatment of the cis-/trans-1,3-oxathiolane nucleosides (or protected derivatives thereof) with a pyrimidine base (or it derivatives thereof) and an acid, (ii) adding a suitable acid to the obtained cis-/trans-mixture of isomers, (iii) selective crystallization of the desired cis-isomer salt from a solvent or combination of solvents, and (iv) treatment of the predominantly cis-isomer salt with a suitable base to offer the free 1,3-oxathiolane nucleosides, and thereafter optionally repeating steps (i) to (iv) inclusive.

    摘要翻译: 从顺式 - 反式-1,3-氧硫杂环戊烷核苷或其受保护的衍生物的混合物制备主要为顺式的1,3-氧硫杂环戊烷核苷类似物的方法,包括:(i) (或其衍生物)和酸,(ii)向得到的异构体的顺式 ​​- 反式混合物中加入合适的酸,(iii)反式-1,3-氧硫杂环戊烷核苷(或其保护的衍生物)与嘧啶碱 )从溶剂或溶剂组合中选择性结晶所需的顺式异构体盐,和(iv)用合适的碱处理主要为顺式异构体盐以提供游离的1,3-氧硫杂环戊烷核苷,然后任选重复步骤 (i)至(iv)包括在内。