Synthesis of 3‘-Fluoro-2‘,3‘-dideoxy-2‘,3‘-didehydro-4‘-ethynyl-<scp>d</scp>- and -<scp>l</scp>-furanosyl Nucleosides
作者:Xin Chen、Wen Zhou、Raymond F. Schinazi、Chung K. Chu
DOI:10.1021/jo049597h
日期:2004.9.1
An efficient procedure has been developed for the synthesis of 3‘-fluoro-2‘,3‘-dideoxy-2‘,3‘-didehydro-4‘-ethynyl d- and l-furanosyl nucleosides (1 and 2) starting from 2,3-O-isopropylidene-d-glyceraldehyde. The key intermediate 1-O-benzoyl-3E-fluoro-3,4-unsaturated-5,6-di(tert-butyldimethylsilyloxy)-2-hexanone 8 was obtained in nine steps with the overall yield of 22%. The α,β-unsaturated ketone 8
已经开发了一种有效的方法,用于合成从2开始的3'-氟-2',3'-二脱氧-2',3'-二氢-4'-乙炔基d-和1-呋喃糖基核苷(1和2) ,3- ø异亚丙基d甘油醛。关键中间体1- ö苯甲酰基3 é氟-3,4-不饱和-5,6-二(叔-butyldimethylsilyloxy)-2-己酮8在九个步骤22%的总产率得到。然后在典型的格利雅德反应程序中,用乙炔基溴化镁处理α,β-不饱和酮8,得到两种中间体9和参见图10,其在脱保护,氧化和乙酰化后分别得到相应的4-乙炔基取代的d-和l-糖部分15和16。通过将糖部分与各种甲硅烷基保护的碱基偶联来制备一系列的d-和1- y-嘧啶和嘌呤核苷。缩合后得到异头混合物。分离后,将β-异构体进一步脱保护,得到目标核苷。测试了所有新合成的4'-取代核苷的抗HIV活性,其中d-腺嘌呤衍生物显示出中等的抗HIV活性(EC 50 = 25.1μM),而没有明显的细胞毒性。