[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[NH:11][C:10](=[O:12])[CH2:9][CH2:8][N:7]([CH:13]3[CH2:17][CH2:16][CH2:15][CH2:14]3)[C:6]=2[N:18]=1.[CH3:19]I.[H-].[Na+]>CN(C=O)C>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[N:11]([CH3:19])[C:10](=[O:12])[CH2:9][CH2:8][N:7]([CH:13]3[CH2:17][CH2:16][CH2:15][CH2:14]3)[C:6]=2[N:18]=12-Chloro-9-cyclopentyl-5,7,8,9-tetrahydro-6H-pyrimido[4,5-b][1,4]diazepin-6-one (0.318 g, 0.0012 mol) and MeI (0.088 mL, 0.0014 mol, 1.18 eq) were added to DMF (5 mL) and the solution cooled to −10° C. NaH (0.03 g, 0.0013 mol, 1.07 eq) was added and the RM was stirred at 0° C. for 30 min and rt for 30 min. The solvent was evaporated under reduced pressure and the product extracted using EtOAc/H2O. The organic extracts were combined, washed with sat NaCl, dried (MgSO4) and evaporated under reduced pressure to give the product as a purple oily residue (0.25 g, 75%); 1H (DMSO-d6): δ 1.55 (4H, m, 2CH2), 1.7 (2H, m, CH2), 1.9 (2H, m, CH2), 2.63 (2H, t, J=5 Hz, CH2), 3.17 (3H, s, CH3), 3.65 (2H, t, J=5 Hz, CH2), 4.74 (1H, m, CH), 8.14 (1H, s, CH); MS+ve: 281.2; Rt=3.11 min (Analytical—1).
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