An antibiotic 2'-amino-2'-deoxyguanosine (I) was synthesized chemically from a guanine 8, 2'-O-cyclonucleoside (II), which could be obtained from guanosine. Compound (II) was converted to N2, 3', 5'-triacetyl derivative (III), which was subjected to opening of the anhydro linkage with liq. H2S in pyridine. Resulting 8-mercaptoarabinofuranosylguanine (IV) was dethiolated and mesylated to give N2, 3', 5'-triacetyl-2'-mesylarabinosylguanine (VI). Deprotection of VI and reprotection with tetrahydropyranyl groups gave compound VIII. Reaction of the compound VIII with sodium azide in acetamide at 210°for 10 min gave 2'-azido compound (IX). The compound IX was deprotected to give 2'-azido-2'-deoxyguanosine (X). Raney nickel catallyzed hydrogenolysis of X gave 2'-amino-2'-deoxyguanosine, which was proved to be identical with a sample of the antibiotic.
抗生素
2'-氨基-2'-脱氧鸟苷 (I) 由
鸟嘌呤 8, 2'-O-环核苷 (II)
化学合成,
鸟嘌呤 8, 2'-O-环核苷 (II) 可以从
鸟苷中获得。将化合物(II)转化为N 2,3',5'-三乙酰基衍
生物(III),用liq打开其脱
水键。
吡啶中的
H2S。将所得8-巯基阿拉伯
呋喃鸟嘌呤(IV)脱
硫基并
甲磺酸化,得到N2,3',5'-三乙酰基-2'-甲磺酰阿拉伯
鸟嘌呤(VI)。 VI的脱保护并用
四氢吡喃基团再保护得到化合物VIII。化合物VIII与
叠氮化
钠在乙酰胺中于210℃反应10分钟,得到2'-
叠氮基化合物(IX)。将化合物IX脱保护,得到2'-
叠氮基-
2'-脱氧鸟苷(X)。雷尼
镍催化 X 氢解得到
2'-氨基-2'-脱氧鸟苷,经证明与抗生素样品相同。