Process for preparing purine derivates.

摘要

There is disclosed a process for preparing purine derivatives of the formula I <CHEM> wherein R1 represents hydrogen, CH3CO or a higher acyl, R3 represents hydrogen, CH3CO or a higher acyl, CF3CO, CCl3CO, PhCO or CH2 AR, such as benzyl or substituted benzyl, and benzoisothiazolyl-S,S-dioxide, and Z represents OH, hydrogen or halo. Said compounds are either drugs or prodrugs for the treatment of herpes infections. There are also disclosed some novel compounds of formula I useful as prodrugs.