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-yl)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及其药用盐的制备方法,包括以下步骤:a) 使用(R)-4-甲基-1,3-二氧杂
环戊酮烷基化
腺嘌呤并分离(R)-1-(6-
氨基-9H-
嘌呤-9-基)
丙醇;b) 使用二烷基对
甲苯磺酰氧
甲基膦酸酯或二烷基卤代
甲基膦酸酯对(R)-1-(6-
氨基-9H-
嘌呤-9-基)
丙醇进行烷基化,得到(R)-9-[2-(
磷酸甲氧基)丙基]
腺嘌呤的二烷基酯;c) 通过微波辐射下使用矿酸去烷基化
磷酸酯部分,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的盐。