[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[NH:11][C:10](=[O:12])[C:9]([F:14])([CH3:13])[CH2:8][N:7]([CH:15]3[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]3)[C:6]=2[N:21]=1.[H-].[Na+].[CH3:24]I>CC(N(C)C)=O>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[N:11]([CH3:24])[C:10](=[O:12])[C:9]([F:14])([CH3:13])[CH2:8][N:7]([CH:15]3[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]3)[C:6]=2[N:21]=1To a solution of 2-chloro-9-cyclohexyl-7-fluoro-7-methyl-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one (313 mg, 2.85 mmol) in 10 mL of DMA was added sodium hydride (60% dispersion in mineral oil, 44 mg, 1.1 mmol) at 0° C., followed by the dropwise addition of methyl iodide (0.07 mL, 1.1 mmol). The reaction mixture was warmed up to rt and stirred for 1 h. The whole was poured into ice-water, extracted with ethyl acetate. The organic layer was washed with brine and dried over Na2SO4. The solution was concentrated in vacuo and used for next step reaction (330 mg). [M+H] calc'd for C15H20ClFN4O, 327; found 327.
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