[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.CI.[CH3:21]C(C)=O.C(=O)=O.[H-].[Na+]>CN(C=O)C>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[N:11]([CH3:21])[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 (318 mg, 0.0012 mol) and MeI (88 μl, 0.0014 mol, 1.18 eq) were added to DMF (5 ml) and the solution cooled to −10° C. using acetone/dry ice before the addition of NaH (30 mg, 0.0013 mol, 1.07 eq). The RM was then stirred at 0° C. for 30 min and rt for 30 min. The RM was concentrated and the product extracted using EtOAc/H2O. The organic extracts were combined, washed with sat NaCl, dried using MgSO4, filtered and the filtrate evaporated under reduced pressure and further dried in vacuo to give the product as a purple oily residue (252 mg, 75%); Rt=13 min (Vydac 1); MS+ve: 281.2.
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