| abstract |
The invention relates to a method for producing methyl-{4,6-diamino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridino-3-yl]pyrimidino-5-yl}methyl carbamate of formula (I) and to a method for purifying the crude product of the compound of formula (I) for use as pharmaceutically active substance. For purification, methyl-{4,6-diamino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridino-3-yl]pyrimidino-5-yl}methyl carbamate-sulfinyldimethane (1:1), i.e. a compound of formula (II) is isolated as an intermediate or is produced as an intermediate in said purification method, optionally present in a mixture. |