A 1 ml portion of chloroform solution containing 11.7 mg of 4-methylsulfinyl-2-({4-[(N-oxidomorpholin-4-yl)methyl]phenyl}amino)pyrimidine-5-carboxamide was mixed with 5.1 mg of cyclopropylamine and 5.8 mg of diisopropylethylamine, followed by stirring at 90° C. for 15 hours. A 1 ml portion of aqueous solution containing 50 mg of sodium hydrogen sulfite was added to the reaction mixture, followed by stirring at room temperature for 4 hours. This was mixed with 0.1 ml of aqueous ammonia and extracted with 2 ml of chloroform. By evaporating the solvent under a reduced pressure and fractionating the residue by an HPLC (Wakosil-II 5C18AR, 0.1% HCOOH—H2O/MeOH=7/3−0/10), 2.6 mg of 4-cyclopropylamino-2-(4-morpholin -4-ylmethylphenylamino)-pyrimidine-5-carboxamide was obtained.
