Process for preparing an antiviral drug and intermediates thereof It comprises the preparation of entecavir of formula (I), or a pharmaceutically acceptable salt thereof, or a hydrate thereof by submitting a compound of formula (III) where X is an halogen selected from Cl, Br, and I, first to a hydrolysis reactionusing formic acid and then to a deprotection reaction, and isolating the entecavir either as free base or as a pharmaceutically acceptable salt. It also comprises intermediates which intervene in this preparation process.
制备抗病毒药物及其中间体的过程包括通过将式(I)的
恩替卡韦或其药用可接受盐或
水合物的制备,首先将式(III)的化合物(其中X是从Cl、Br和I中选择的卤素)提交给
甲酸水解反应,然后进行去保护反应,并将
恩替卡韦作为游离碱或药用可接受盐进行分离。还包括介入该制备过程的中间体。