For its high therapeutic effect, (S)-9-[3-hydroxy-2-(phosphonomethoxy)propyl]adenine (HPMPA) is an important member of a class of acyclic nucleoside phosphonates (ANPs). Although its constitutional isomer, 9-[2-hydroxy-3-(phosphonomethoxy)propyl]adenine (iso-HPMPA), exhibits no antiviral activity, our general interest in C-8 substituted adenine ANPs led us to prepare certain iso-HPMPA derivatives modified at the C-8 position of adenine. Novel alkylating agent, diisopropyl [2-(tetrahydro-2-pyranyl)oxy-3-tosyloxypropoxy]methyl}phosphonate (9), was prepared by procedure starting from allyl alcohol (4). 9-3-[(Diisopropoxyphosphoryl)methoxy]-2-hydroxypropyl}adenine (12) was prepared by alkylation of adenine with the alkylating agent 9 followed by acid hydrolysis, although elimination by-product 9-3-[(diisopropoxyphosphoryl)methoxy]prop-1-enyl}adenine (11) predominated in the reaction mixture. Bromination of the compound 12 gave 8-bromoadenine derivative 13 quantitatively. Nucleophilic substitutions of the bromine atom of compound 13 with N- and O-nucleophiles, followed by phosphonate deprotection, afforded the free phoshonic acids 15–18.
由于其高治疗效果,(S)-9- [3-羟基-2-(磷酸甲氧基)丙基]腺嘌呤(HPMPA)是一类无环核苷酸磷酸酯(ANPs)的重要成员。虽然它的构造异构体,9- [2-羟基-3-(磷酸甲氧基)丙基]腺嘌呤(iso-HPMPA)没有抗病毒活性,但我们对C-8取代腺嘌呤ANPs的普遍兴趣促使我们制备了某些C-8位置修饰的iso-HPMPA衍生物。新型烷基化剂,二异丙基[2-(四氢-2-吡喃基)氧基-3-对甲苯磺酰氧基]丙氧基}磷酸酯(9),通过从烯丙醇(4)开始的程序制备。通过使用烷基化剂9烷基化腺嘌呤,然后进行酸水解制备出9-3-[(二异丙氧基磷酰基)甲氧基]-2-羟基丙基}腺嘌呤(12),尽管消除副产物9-3-[(二异丙氧基磷酰基)甲氧基]丙-1-烯基}腺嘌呤(11)在反应混合物中占主导地位。化合物12的溴化反应定量地给出8-溴腺嘌呤衍生物13。用N-和O-亲核试剂进行化合物13的亲核取代,然后进行磷酸酯去保护,得到了自由的膦酸15-18。