申请人:The Noguchi Institute
公开号:US05811540A1
公开(公告)日:1998-09-22
Disclosed is a 5-O-pyrimidyl-2,3-dideoxy-1-thio-D-furanoside derivative represented by the following formula (I) or an L-form isomer thereof: ##STR1## wherein X represents a hydrogen atom, a fluorine atom or an azido group; R.sup.1 represents a C.sub.1-4 alkyl group; R.sup.2 represents a hydrogen atom, a methyl group or a fluorine atom or a trifluoromethyl group; R.sup.3 represents a C.sub.1-10 alkyl group or a C.sub.6-15 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a chlorine atom, a bromine atom, a methyl group, an ethyl group and a nitro group. When this derivative is reacted with a sulfonium ion-generating reagent to thereby effect an intramolecular N-glycosylation of the derivative, a .beta.-2',3'-dideoxynucleoside derivative which is useful as a precursor of an antiviral agent, such as AZT, DDC or FLT, can be produced with an extremely high stereoselectivity for the .beta.-anomer and in high yield while very little or none of the .alpha.-form isomer corresponding thereto is produced.
本发明涉及一种5-O-嘧啶基-2,3-二去氧-1-硫代-D-呋喃糖衍生物,其由以下公式(I)或其L-型异构体表示:##STR1## 其中X表示氢原子,氟原子或偶氮基;R1表示C1-4烷基;R2表示氢原子,甲基或氟原子或三氟甲基基团;R3表示C1-10烷基或C6-15芳基,该芳基未取代或被至少一种取代基所取代,所述取代基选自氯原子,溴原子,甲基,乙基和硝基等基团。当该衍生物与产生磺离子的试剂反应以实现衍生物的分子内N-糖基化时,可以高度立体选择性地制备出β-2',3'-二去氧核苷衍生物,该衍生物可用作抗病毒剂的前体,例如AZT,DDC或FLT,同时高产率地制得,而几乎不产生相应的α-型异构体。