申请人:——
公开号:US20020198224A1
公开(公告)日:2002-12-26
The present invention is an efficient synthetic route to 2′,3′-dideoxy-2′,3 ′-didehydro-nucleosides from available precursors with the option of introducing functionality as needed, such as, the 2′,3′-dideoxy and 2′- or 3′-deoxyribo-nucleoside analogs as well as additional derivatives obtained by subsequent functional group manipulations. Briefly, the present invention discloses a method for the preparation of &bgr;-D and &bgr;-L-2′,3′-dideoxy-2′,3′-didehydro-nucleosides starting from appropriately substituted ribonucleosides in two, optionally three steps: Step (1) a haloacylation, such as haloacetylation, and in particular, bromoacetylation; Step (2) a reductive elimination; and optionally, Step (3) a deprotection. The haloacylation of step (1) can form the 2′-acyl-3′-halonucleoside, the 3′-acyl-2′-halonucleoside, or a mixture thereof.
本发明提供了一种高效的合成路线,可以从可用的前体物开始合成2',3'-二脱氧-2',3'-二脱氢核苷,同时可以根据需要引入功能,例如2',3'-二脱氧和2'-或3'-脱氧核糖核苷类似物以及通过后续的官能团操作获得的额外衍生物。简而言之,本发明揭示了一种制备β-D和β-L-2',3'-二脱氧-2',3'-二脱氢核苷的方法,从适当取代的核糖核苷开始,在两个可选的步骤中进行:步骤(1)卤代酰化,例如卤代乙酰化,特别是溴代乙酰化;步骤(2)还原消除;可选地,步骤(3)去保护基。步骤(1)的卤代酰化可以形成2'-酰基-3'-卤代核苷,3'-酰基-2'-卤代核苷或它们的混合物。