Base-catalyzed reactions of diethyl [(oxiranylmethoxy)methyl]phosphonate (2) with purine bases (adenine, 2,6-diaminopurine, 6-chloropurine and 2-amino-6-chloropurine) gave corresponding 9- or 7-[2-hydroxy-3-(phosphonomethoxy)propyl] purines. The adenine and 2,6-diaminopurine derivatives cyclize to cyclic phosphonates 4 and 6. The 9-[2-hydroxy-3-(phosphonomethoxy)propyl] derivatives of N6-substituted adenine and 2,6-diaminopurine (15-27) were prepared by the treatment of diethyl [3-(6-chloropurin-9-yl)-2-hydroxypropoxy]methyl}phosphonate (11) or diethyl [3-(2-amino-6-chloropurin-9-yl)-2-hydroxypropoxy]methyl}phosphonate (13) with primary or secondary amines. The reaction of 6-chloro- or 2-amino-6-chloropurine derivatives (11, 13) with thiourea gave the corresponding diethyl purine-6-thiol or 2-aminopurine-6-thiol phosphonates 47, 48. The guanine derivative 49 was prepared by the treatment of compound 13 with 80% acetic acid. All diethyl phosphonates were transformed to free phosphonic acids (31-43, 50-52) by the action of bromotrimethylsilane and subsequent hydrolysis.
碱催化的反应中,二乙基[(环氧甲氧基)甲基]膦酸二乙酯(2)与嘌呤碱基(腺嘌呤、2,6-二氨基嘌呤、6-氯嘌呤和2-氨基-6-氯嘌呤)发生反应,形成相应的9-或7-[2-羟基-3-(膦甲氧基)丙基]嘌呤。腺嘌呤和2,6-二氨基嘌呤衍生物环化形成环磷酸酯4和6。对N6-取代腺嘌呤和2,6-二氨基嘌呤的9-[2-羟基-3-(膦甲氧基)丙基]衍生物(15-27)通过将二乙基[3-(6-氯嘌呤-9-基)-2-羟基丙氧基]甲基}膦酸二乙酯(11)或二乙基[3-(2-氨基-6-氯嘌呤-9-基)-2-羟基丙氧基]甲基}膦酸二乙酯(13)与一级或二级胺处理而制备。6-氯或2-氨基-6-氯嘌呤衍生物(11、13)与硫脲反应得到相应的二乙基嘌呤-6-硫醇或2-氨基嘌呤-6-硫醇膦酸二乙酯47、48。通过将化合物13与80%醋酸处理制备得到鸟嘌呤衍生物49。所有二乙基膦酸二乙酯通过溴三甲基硅烷作用和随后的水解转化为游离膦酸(31-43、50-52)。