N6-Substituted adenine and 2,6-diaminopurine derivatives of 9-[2-(phosphonomethoxy)- ethyl] (PME), 9-[(R)-2-(phosphonomethoxy)propyl] [(R)-PMP] and enantiomeric (S)-PMP series were synthesized by reactions of primary or secondary amines with 6-chloro-9-[2-(diisopropoxyphosphoryl)methoxy]alkyl}purines (26-28) or 2-amino-6-chloro-9-[2-(diisopropoxy- phosphoryl)methoxy]alkyl}purines (29-31) followed by treatment of the diester intermediates32with bromo(trimethyl)silane and hydrolysis. Diesters32were also obtained by reaction ofN6-substituted purines with synthons23-25bearing diisopropoxyphosphoryl group. Alkylation of 2-amino-6-chloropurine (9) with diethyl [2-(2-chloroethoxy)ethyl]phosphonate (148) gave the diester149which was analogously converted toN6-substituted 2,6-diamino- 9-[2-(2-phosphonoethoxy)ethyl]purines151-153. Alkylation ofN6-substituted 2,6-diaminopurines with (R)-[(trityloxy)methyl]oxirane (155) followed by reaction of thus-obtained intermediates156with dimethylformamide dimethylacetal and condensation with diisopropyl [(tosyloxy)methyl]phosphonate (158) followed by deprotection of the intermediates159gaveN6-substituted 2,6-diamino-9-[(S)-3-hydroxy-2-(phosphonomethoxy)propyl]purines160-163. The highest cytostatic activityin vitrowas exhibited by the followingN6-derivatives of 2,6-diamino-9-[2-(phosphonomethoxy)ethyl]purine (PMEDAP): 2,2,2-trifluoroethyl (53), allyl (54), [(2-dimethylamino)ethyl] (68), cyclopropyl (75) and dimethyl (91). In CCRF-CEM cells, the cyclopropyl derivative75is deaminated to the guanine derivative PMEG (3) which is then converted to its diphosphate.
N6-取代腺嘌呤和2,6-二氨基嘌呤衍生物9-[2-(磷酸甲氧基)-乙基](PME)、9-[(R)-2-(磷酸甲氧基)丙基] [(R)-PMP] 和对映体(S)-PMP 系列通过初级或次级胺与6-氯-9-[2-(二异丙氧磷酰基)甲氧基]烷基}嘌呤(26-28)或2-氨基-6-氯-9-[2-(二异丙氧磷酰基)甲氧基]烷基}嘌呤(29-31)的反应合成,随后用溴化(三甲基)硅烷和水解处理二酯中间体32。二酯32也可通过N6-取代嘌呤与带有二异丙氧磷酰基的合成物23-25发生反应获得。2-氨基-6-氯嘌呤(9)与二乙基[2-(2-氯乙氧基)乙基]磷酸酯(148)的烷基化反应得到二酯149,类似地转化为N6-取代2,6-二氨基-9-[2-(2-磷酸乙氧基)乙基]嘌呤151-153。N6-取代2,6-二氨基嘌呤与(R)-[(三苄氧基)甲基]环氧乙烷(155)发生烷基化反应,随后用二甲基甲酰胺二甲基缩醛和与异丙基[(对甲苯磺酰氧基)甲基]磷酸酯(158)发生缩合反应,然后去保护中间体159得到N6-取代2,6-二氨基-9-[(S)-3-羟基-2-(磷酸甲氧基)丙基]嘌呤160-163。体外细胞毒活性最高的是以下2,6-二氨基-9-[2-(磷酸甲氧基)乙基]嘌呤(PMEDAP)的N6-衍生物:2,2,2-三氟乙基(53)、烯丙基(54)、[(2-二甲基氨基)乙基](68)、环丙基(75)和二甲基(91)。在CCRF-CEM细胞中,环丙基衍生物75被脱氨基化为鸟嘌呤衍生物PMEG(3),然后转化为其二磷酸盐。