(+-)-cis-[4-[(2,5-Diamino-6-chloropyrimidinyl)amino]-2- cyclopentenyl]carbinol (5a) was synthesized from 2-amino-4,6-dichloropyrimidine and cis-4-(hydroxymethyl)cyclopentenylamine (2a) by subsequent preparation of the 5-[(4-chlorophenyl)azo] derivative of the resulting pyrimidine (3a) and reduction of the azo moiety with zinc and acetic acid. The carbocyclic analogue of 2',3'-didehydro-2',3'-dideoxy 2-amino-6-chloropurine (6a) and the corresponding 8-azapurine (9a) were prepared from 5a. The carbocyclic 2',3'-didehydro-2',3'-dideoxy analogues of guanine (7a) and 2,6-diaminopurine (8a), and 8-azaguanine (10a) and 8-aza-2,6-diaminopurine (11a) were prepared from 6a and 9a, respectively. The corresponding 2',3'-saturated series of 2-amino-6-substituted-purine carbocyclic nucleosides was prepared following the same scheme starting with cis-4-(hydroxymethyl)cyclopentylamine (2b). Carbocyclic 2',3'-didehydro-2',3'-dideoxyguanosine (carbovir, 7a) emerged as a potent and selective anti-HIV agent. Its hydrolytic stability and its ability to inhibit the infectivity and replication of HIV in T-cells at concentrations of approximately 200-400-fold below toxic concentrations make carbovir an excellent candidate for development as a potential antiretroviral agent.

中文翻译：

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碳环2'，3'-didehydro-2'，3'-二脱氧2,6-二取代嘌呤核苷的合成及抗HIV活性。

由2-氨基-4,6-二氯嘧啶和顺式-4-合成（+-）-顺-[4-[（2,5-二氨基-6-氯嘧啶基）氨基] -2-环戊烯基]甲醇（5a）通过随后制备所得嘧啶（3a）的5-[（4-氯苯基）偶氮]衍生物并用锌和乙酸还原偶氮部分来制备（羟甲基）环戊烯基胺（2a）。由5a制备2′，3′-二氢-2′，3′-二脱氧2-氨基-6-氯嘌呤（6a）的碳环类似物和相应的8-氮杂嘌呤（9a）。鸟嘌呤（7a）和2,6-二氨基嘌呤（8a）和8-氮杂鸟嘌呤（10a）和8-氮杂-2,6-二氨基嘌呤的碳环2'，3'-didehydro-2'，3'-dideoxy类似物（11a）分别由6a和9a制备。对应的2'，3' 按照相同的方案，从顺式-4-（羟甲基）环戊胺（2b）开始，制备2-氨基-6-取代的嘌呤碳饱和的2-氨基系列取代的碳环核苷。碳环2'，3'-didehydro-2'，3'-dideoxyguanosine（carbovir，7a）作为有效的选择性抗HIV药物出现。它的水解稳定性和抑制T细胞中HIV感染性和复制的能力（浓度低于毒性浓度约200-400倍）使carbovir成为发展为潜在抗逆转录病毒药物的极佳候选者。