An improved process for the preparation of Tenofovir disoproxil and pharmaceutically acceptable salts thereof, comprising following steps: a) alkylation of adenine with (R)-4-methyl-1,3-dioxolan-2-one and isolation of (R)-1-(6-amino-9H-purin-9-yI)propan-2-ol; b) alkylation of (R)-1-(6-amino-9H-purin-9-yl) propan-2-ol with a dialkyl p-toluenesulphonyloxymethylphosphonate or dialkyl halomethylphosphonate to give dialkylester of (R)-9-[2-(phosphonomethoxy)propyl]adenine; c) preparation of (R)-9-[2-(phosphonomethoxy)propyl]adenine ((R)-PMPA; Tenofovir) by dealkylation of the phosphonate moiety with a mineral acid under microwave irradiation; d) preparation of Tenofovir disoproxil; e) preparation of the fumarate salt or other pharmaceutically acceptable salt of Tenofovir disoproxil.
一种改进的Tenofovir disoproxil及其药用可接受盐的制备方法,包括以下步骤:a)用(R)-4-甲基-1,3-二氧杂环己-2-酮烷基化
腺嘌呤,分离(R)-1-(6-
氨基-9H-
嘌呤-9-yl)丙-2-醇;b)用二烷基对
甲苯磺酰氧
甲基膦酸酯或二烷基卤代
甲基膦酸酯烷基化(R)-1-(6-
氨基-9H-
嘌呤-9-yl)丙-2-醇,得到(R)-9- [2-(
磷酸甲氧基)丙基]
腺嘌呤的二烷基酯;c)通过微波辐射下的矿酸去烷基化
磷酸酯基团制备(R)-9- [2-(
磷酸甲氧基)丙基]
腺嘌呤((R)-
PMPA; Tenofovir);d)制备Tenofovir disoproxil;e)制备Tenofovir disoproxil的
富马酸盐或其他药用可接受盐。