The present invention provides a process for the preparation of a 2'-deoxy-L-nucleoside comprising the following steps:
a) preparing from a suitably protected and activated L-furanose a 2-S-substituted-2-deoxy-L-furanose of the following formula:
wherein B is a heterocyclic or heteroaromatic base, R8 and R9 are independently hydrogen or a suitable protecting group; R7 is a suitable protecting group;
b) cyclizing the 2-S-substituted-2-deoxy-L-furanose to form a cyclonucleoside of the following formula:
and
c) reducing the cyclonucleoside to a 2'-deoxy-L-nucleoside.
本发明提供了一种制备 2'-脱氧-L-核苷的工艺,包括以下步骤:
a) 由适当保护和活化的 L-
呋喃糖制备下式的 2-S-取代的-2-脱氧-L-
呋喃糖:
其中 B 是杂环基或杂芳香基,R8 和 R9 独立地为氢或合适的保护基团;R7 是合适的保护基团;
b) 环化 2-S-取代的-2-脱氧-L-
呋喃糖,形成下式的环核苷:
和
c) 将环核苷还原成 2'-脱氧-L-核苷。