Synthesis of carbon-bridged 8,5'-cyclopurine nucleosides: Nucleosides and nucleotides—XXIV
作者:A. Matsuda、M. Tezuka、K. Niizuma、E. Sugiyama、T. Ueda
DOI:10.1016/0040-4020(78)88398-7
日期:1978.1
borohydride proceeded stereoselectively to give the 8,5'(S)-cycloadenosine. The 5'-R-isomer was obtained by the inversion of the 5'-OH group of the S-epimer via the mesyloxy derivative. Hydrolytic deamination of 8,5'-cycloadenosines gave the inosine counterparts. Photo-irradiation of 2',3'-O-isopropylidene-5'-deoxy-5'-phenylthio-N2-benzoylguanosine afforded the 8,5'-cyclo-5'-deoxyguanosine, which was also converted
用氧化硒处理2′,3′-O-异亚丙基-5′-脱氧-8,5′-环腺苷,得到5′-氧代化合物。用硼氢化钠还原产物进行立体选择,得到8,5'(S)-环腺苷。通过甲磺酰氧基衍生物使S-表异构体的5'-OH基团反转,从而获得5'- R-异构体。8,5′-环腺苷的水解脱氨基得到了肌苷对应物。2',3'-O-异亚丙基-5'-脱氧-5'-苯硫基-N 2-苯甲酰基鸟苷的光辐照得到8,5'-环-5'-脱氧鸟苷,它也转化为5' -氧代衍生物。产物的还原还提供了8,5'-(S)-环鸟苷。这些环核苷的CD光谱反映了5'-位的手性。