4-(2-(1-(tert-Butoxycarbonylamino)propan-2-yloxy)-4-fluorophenylamino)-5-methyl-thieno[2,3-d]pyrimidine-6-carboxylic acid (250 mg) and TBTU (170 mg) was dissolved in DMF (3 ml) and triethylamine (1900) was added. The mixture was stirred at room temperature for 10 min, then 0.5 ml conc. ammonia was added. The reaction was stirred for 2 h. Then the reaction mixture was concentrated in vacuo and purified by RP-chromatography (water with 0.2% trifluoroacetic acid/methanol 72-100%) to give the title compound.
