Structure−Activity Relationships of 2‘-Deoxy-2‘,2‘-difluoro-<scp>l</scp>-<i>erythro</i>-pentofuranosyl Nucleosides
作者:Lakshmi P. Kotra、Yuejun Xiang、M. Gary Newton、Raymond F. Schinazi、Yung-C. Cheng、Chung K. Chu
DOI:10.1021/jm970275y
日期:1997.10.1
-pentofuranosyl nucleosides as potential antiviral agents. The target compounds were synthesized via the key intermediates 7a or 7b from L-gulono gamma-lactone. Compound 2 was oxidatively cleaved and coupled with ethyl bromodifluoroacetate in the presence of activated zinc under Reformatsky conditions to obtain a diasteomeric mixture of 4(R) and 4(S), in a 4:1 ratio. The major 4(R) isomer was cyclized
根据最近的发现,一些L-核苷比其D-对应物更有效或相等,我们合成了2'-脱氧-2',2'-二氟-L-赤型戊呋喃糖基核苷作为潜在的抗病毒剂。通过关键中间体7a或7b从L-古洛诺γ-内酯合成目标化合物。在活化锌存在下,在Reformatsky条件下,将化合物2氧化裂解并与溴二氟乙酸乙酯偶联,以4:1的比例获得4(R)和4(S)的非对映异构混合物。使主要的4R异构体环化并进行适当处理,以获得甲磺酸酯8a或8b,将其与各种甲硅烷基保护的嘧啶缩合。在Mitsunobu条件下将醇7a或7b与6-氯嘌呤缩合,得到6-氯嘌呤类似物53a或53b和54a或54b。进一步处理化合物53a,54a和53b,54b,分别得到肌苷和腺嘌呤衍生物57-60。2-氨基-6-氯嘌呤与化合物8a的缩合,然后用2-巯基乙醇/甲醇钠处理,得到鸟嘌呤类似物63和64。评估了所有合成的核苷31-52、57-60、63和64抗病毒活