Process for chemical synthesis of methoxy nucleosides.
甲氧基核苷化合物的化学合成过程。
Synthesis of methoxy nucleosides and enzymatic nucleic acid molecules
申请人:RIBOZYME PHARMACEUTICALS, INC.
公开号:EP1108724A2
公开(公告)日:2001-06-20
This invention relates to chemical synthesis of 2'-O-methyl, 3'-O-methyl and 5'-O-methyl nucleosides, incorporation of novel chemical modifications in enzymatic nucleic acid molecules and improved methods for the synthesis of enzymatic nucleic acid molecules.
We developed several improvedapproaches toward 2′-O-methyl adenosine and guanosine and their N-acyl derivatives. (a) Transglycosylation of N4-acetyl-5′, 3′-di-O-acetyl-2′-O-methyl cytidine with N6-Bz-adenine provided N6-benzoyl-5′3′-di-O-acetyl-2′-O-methyl adenosine in 50% yield. (b) Regioselective methylation of 2-amino-6-chloro purine riboside with MeI/NaH followed by hydrolysis provided 2′-O-Me-guanosine
我们针对2'- O-甲基腺苷和鸟苷及其N-酰基衍生物开发了几种改进的方法。(a)用N 6 -Bz-腺嘌呤将N 4-乙酰基-5',3'-二-O-乙酰基-2'- O-甲基胞苷进行糖基化,得到N 6-苯甲酰基-5'3'-二-O -乙酰基-2'- O-甲基腺苷,产率为50%。(b)用MeI / NaH对2-氨基-6-氯嘌呤核糖核苷进行区域选择性甲基化,然后水解,从而以高收率提供了2' - O -Me-鸟苷。相同的2' - O -Me前体被转化为2'- O-Me-腺苷,收率58%。(c)通过5',3'- O- TIPDSi衍生物的甲基化和选择性的N 2-,将2,6-二氨基嘌呤核糖苷非常有效地转化为N 2-异丁酰基(异丙基苯氧基乙酰基)2' - O - Me-鸟苷。酰化,脱氨基和去甲硅烷基化可提供目标化合物的70%合并收率。(d)N 1 -Bzl-鸟苷的Mg 2+和Ag +定向甲基化以大于80%的产率进行,比率为2'-