Treatment of lithiated 2', 3', 5'-tri-Ο-protected uridine and 6-chloropurine ribonucleoside with diethyl chlorophosphate, followed by deblocking (and amination) and hydrolysis, provided 5-and 6-phosphonouridine (IV and VII), and 8-phosphonoadenosine (Xb), respectively. The Arbuzov reaction of 2', 3', 5'-tri-Ο-protected 4-chloro-2 (1H) -pyrimidinone ribonucleoside and triethyl phosphite afforded the diethyl 4-phosphonate derivative (XII). Compounds IV, VII and Xb, and their respective diethyl esters (IIb and VIb) and monoethyl ester (Xa) were inactive in vitro as antiviral and cytostatic agents, but the diethyl 8-phosphonate derivative (IXb) of 6-chloro-9- (β-D-ribofuranosyl) purine (VIIIa) showed some antiviral and cytostatic activities, which were comparable in all respects to those of VIIIa.
用二
氯磷酸二乙酯处理
锂化的2', 3', 5'-三-O-保护的
尿苷和
6-氯嘌呤核苷,随后去保护(和
氨基化)和
水解,分别得到了5-和6-
磷酰
尿苷(IV和VII)以及8-
磷酰
腺苷(Xb)。对2', 3', 5'-三-O-保护的4-
氯-2(1H)-
嘧啶酮核苷和三
乙基磷酸酯的阿尔布佐夫反应生成了
二乙基4-
磷酸酯衍
生物(XII)。化合物IV、VII和Xb及其相应的
二乙基酯(IIb和VIb)和单乙基酯(Xa)在体外作为抗病毒和抗细胞增殖剂无活性,但6-
氯-9-(β-
D-核糖基)
嘌呤(VIIIa)的
二乙基8-
磷酸酯衍
生物(IXb)表现出一定的抗病毒和抗细胞增殖活性,其效果在各方面与VIIIa相当。