To the mixture of 100 mg (0.30 mmoles) of 7-(2,2-dimethyl-propyl)-6-(4-oxo-piperidin-1-ylmethyl)-7H-pyrrolo[2,3-d]pyrimidine-2-carbonitrile, 60 mg (0.48 mmoles) of 3-Imidazol-1-yl-propylamine and 0.15 ml (1.1 mmoles) of triethylamine in 5 ml of CH2Cl2, 58 mg (1.1 mmoles) of MgSO4 is added at ambient temperature. The mixture is stirred for 15.5 hours at ambient temperature. The reaction mixture is filterlated to remove MgSO4 and concentrated under reduced pressure to give crude imine. To a solution of crude imine in 5 ml of MeOH, 13 mg (0.33 mmoles) of NaBH4 is added at −10-−20° C., and the reaction mixture is stirred at 0° C. for 4.5 hours. After addition of 5 ml of acetone, the mixture is concentrated, diluted with H2O, and then extracted with CH2Cl2. The combined extrats are washed with brine, dried over MgSO4 and concentrated under reduced pressure. The residue is purified by silica gel column chromatography to give 95 mg of desired 7-(2,2-dimethyl-propyl)-6-[4-(3-imidazol-1-yl-propylamino)-piperidin-1-ylmethyl]-7H-pyrrolo[2,3-d]pyrimidine-2-carbonitrile in 73% yield.
