The invention provides a new convergent approach for the synthesis of 2'-fluoro-6'-methylene-carbocyclic adenosine (FMCA) and 2'-fluoro-6'-methylene-carbocyclic guanosine (FMCG) from a readily available starting material in eight steps. An efficient and practical methodology for stereospecific preparation of a versatile carbocyclic key intermediate, (1S,3R,4R)-3-tert-butoxy-4-(tert-butoxymethyl)-2-fluoro-5-methylenecyclopentanol (compound 8 of scheme 1A or a) in only six (6) steps is also provided. Prodrugs of these compounds are also prepared.
本发明提供了一种新的聚合方法,可从易于获得的起始原料出发,通过八个步骤合成 2'-fluoro-6'-methylene-carbocyclic adenosine (
FMCA) 和 2'-fluoro-6'-methylene-carbocyclic guanosine (
FMCG)。此外,还提供了一种高效实用的方法,只需六(6)步即可立体特异性地制备多功能碳环关键中间体--(1S,3R,4R)-3-叔丁氧基-4-(叔丁氧甲基)-2-
氟-5-亚甲基
环戊醇(方案 1A 或 a 中的化合物 8)。还制备了这些化合物的原药。