[H-].[Na+].[Cl:3][C:4]1[N:5]=[CH:6][C:7]2[NH:13][C:12](=[O:14])[C:11]3([CH2:16][CH2:15]3)[CH2:10][N:9]([C@@H:17]3[CH2:21][CH2:20][C:19]([F:23])([F:22])[CH2:18]3)[C:8]=2[N:24]=1.[CH3:25]I>>[Cl:3][C:4]1[N:5]=[CH:6][C:7]2[N:13]([CH3:25])[C:12](=[O:14])[C:11]3([CH2:16][CH2:15]3)[CH2:10][N:9]([C@@H:17]3[CH2:21][CH2:20][C:19]([F:23])([F:22])[CH2:18]3)[C:8]=2[N:24]=160% sodium hydride in mineral oil (0.25 g, 6.23 mmol) was added to a mixture of (R)-2′-chloro-9′-(3,3-difluorocyclopentyl)-8′,9′-dihydrospiro[cyclopropane-1,7′-pyrimido[4,5-b][1,4]diazepin]-6′(5′H)-one (1.95 g, 5.94 mmol) and methyl iodide (0.41 ml, 6.53 mmol) dimethylacetamide (20 mL). The reaction mixture was stirred at room temperature for 25 minutes. Ice was added to the reaction mixture. A solid crashed out and was filtered off, rinsing with water. The solid was dried in a pistol under vacuo for 3 hours. The compound was obtained as a light pink solid (1.863 g, 92% yield).
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