| abstract |
The present invention relates to a compound of formula (I): Preparation of methyl {4,6-diamino-2- [1- (2-fluorobenzyl) -1H-pyrazolo [3,4-b] pyridin-3-yl] pyridin-5-yl} methylcarbamate And for purification, methyl {4,6-diamino-2- [1- (2-fluorobenzyl) -1H-pyrazolo [3,4-b] pyridin-3-yl] pyrimidin-5-yl} methylcarbamate Sulfinyldimethane (1: 1), ie, a compound of formula (II) is isolated as an intermediate or produced as an intermediate in the purification process, present in a mixture where appropriate, The present invention relates to a method for purifying a crude product of formula (I) for use as a pharmaceutically active compound. |