Intermediates of Formula (III)
wherein Y1 is acyloxy, wherein acyl is of the formula R—C(O)—, wherein R is alkyl of 1-6 carbon atoms, Y2 is aralkyloxy, and Z is benzoyloxy or acyloxy, wherein acyl is as defined above.
Intermediates of formula (III) are useful in a novel process for preparing the mono-L-valine ester of 2-(2-amino-1,6-dihydro-6-oxo-purin-9-yl)methoxy-1,3-propanediol (ganciclovir). The mono-L-valine ester of ganciclovir and its pharmaceutically acceptable salts are of value as antiviral agents with improved absorption.
III式中间体,其中Y1为酰氧基,其中酰基为R-C(O)-的式子,其中R为1-6个碳原子的烷基,Y2为芳基烷氧基,Z为苯甲氧基或酰氧基,其中酰基如上所述。III式中间体在一种新的制备2-(2-
氨基-1,6-二氢-6-氧杂
嘧啶-9-基)甲氧基-
1,3-丙二醇(甘昔洛韦)的单
L-缬氨酸酯的过程中有用。甘昔洛韦的单
L-缬氨酸酯及其药学上可接受的盐具有改善吸收的抗病毒剂价值。