2, 6-Diamino-9-β-D-ribofuranosylpurine (I) was brominated with saturated bromine-water to the 8-bromo compound (II), which was tosylated at the 2'-hydroxygroup via the 2', 3'-O-dibutylstannylene compound (III). The resulting 2, 6-diamino-8-bromo-9-(2'-O-tosyl-β-D-ribofuranosyl)-purine (IV) was cyclized with thiourea in n-propanol or 40% sodium hydrogen sulfide to give 2, 6-diamino-8, 2'-anhydro-8-mercapto-9-β-D-arabinofuranosylpurine (V) in yields of 40% and 80%, respectively. Alternatively, 8, 2'-anhydro-8-mercapto-9-β-D-arabinofuranosylguanine (VI) was acetylated and chlorinated with phosphoryl chloride to give the 2-amino-6-chloropurine-8, 2'-S-cyclonucleoside derivative (VIII), which was aminated with ammonia in methanol to afford the 2, 6-diaminopurine cyclonucleoside (V) in a yield of 45%. Catalytic desulfurization of the cyclonucleoside (V) gave 2, 6-diamino-9-(2'-deoxy-β-D-ribofuranosyl)-purine (IX). Some physical properties of these compounds were elucidated by ultraviolet (UV), nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy. The CD spectra of these nucleosides and cyclonucleoside were similar to those of the corresponding adenine nucleosides and cyclonucleoside in general.
将 2,6-二
氨基-9-β-D-
呋喃核糖基
嘌呤 (I) 用饱和
溴水溴化,得到 8-
溴化合物 (II),再通过 2',3'-O-二丁基亚
锡化合物 (III) 在 2'-羟基上进行
对甲苯基化。得到的 2,6-二
氨基-8-
溴-9-(2'-O-
对甲苯磺酸-β-D-
呋喃核糖基)-
嘌呤 (IV) 在正
丙醇或 40%
硫化氢钠中与
硫脲环化,得到 2,6-二
氨基-8,2'-脱
水-8-巯基-9-β-D-阿拉伯
呋喃糖基
嘌呤 (V),产率分别为 40% 和 80%。另外,将 8,2'-脱
水-8-巯基-9-β-D-阿拉伯
呋喃糖基
鸟嘌呤(VI)乙酰化并用
磷酰
氯氯化,得到
2-氨基-6-氯嘌呤-8,2'-S-环核苷衍
生物(VIII),该衍
生物在
甲醇中用
氨进行胺化,得到 2,6-二
氨基
嘌呤环核苷(V),产率为 45%。对环核苷 (V) 进行催化脱
硫,得到 2,6-二
氨基-9-(2'-脱氧-β-D-
呋喃核糖基)-
嘌呤 (IX)。这些化合物的一些物理性质通过紫外线(UV)、核磁共振(NMR)和圆二色光谱(CD)得到了阐明。这些核苷和环核苷的 CD 光谱与相应的
腺嘌呤核苷和环核苷的一般光谱相似。