PROCESS FOR THE PREPARATION OF INTERMEDIATES IN THE SYNTHESIS OF 2- (PURIN-9-YL) - TETRAHYDROFURAN-3,4-DIOL DERIVATIVES

摘要

A process for preparing a compound of formula (II) Which comprises reacting a compound of formula (IV) wherein P1 represents a protecting group which is a cyclic ether connected to the purine ring nitrogen in the 2-position, or a salt thereof, with a compound of formula (V) R2NH2 (V) followed by deprotection and optional salt conversion to yield the compound of formula (II) or a salt thereof.