[Cl:1][C:2]1[N:11]=[CH:10][C:9]2[N:8]([CH2:12][C:13]([F:16])([F:15])[CH3:14])[C:7](=[O:17])[CH:6]3[CH2:18][O:19][CH2:20][CH2:21][N:5]3[C:4]=2[N:3]=1.IC.[CH3:24]C([O-])(C)C.[Na+]>CS(C)=O>[Cl:1][C:2]1[N:11]=[CH:10][C:9]2[N:8]([CH2:12][C:13]([F:16])([F:15])[CH3:14])[C:7](=[O:17])[C:6]3([CH3:24])[CH2:18][O:19][CH2:20][CH2:21][N:5]3[C:4]=2[N:3]=1To a mixture of 2-chloro-5-(2,2-difluoropropyl)-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (466 mg, 1.46 mmol) and iodomethane (0.365 ml, 5.84 mmol) in DMSO (8 ml) at 0° C. was added sodium 2-methylpropan-2-olate (211 mg, 2.19 mmol). The ice-bath was removed and the reaction mixture was stirred at room temperature for 16 hours. The reaction mixture was poured into water and extracted with EtOAc. The organic layers were washed with water (containing Na2S2O3), dried and concentrated in vacuo to give a crude solid. The solid was purified by silica gel chromatography (hexane/ethyl acetate, 19:1 to 2:1) to afford 2-chloro-5-(2,2-difluoropropyl)-6a-methyl-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one (264 mg, 0.793 mmol, 54% yield) as a white solid. MS [M+H] found 333.
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