4,7-Dichloropyrido[3,2-d]pyrimidine → (4S,6S)-4-(5-((7-chloropyrido[3,2-d]pyrimidin-4-yl)amino)-2-fluoro-3-methylphenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine

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Reaction Conditions

Reaction Steps

To a mixture of (4S,6S)-4-(5-amino-2-fluoro-3-methylphenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine (0.044 g, 0.136 mmol) and 4,7-dichloropyrido[3,2-d]pyrimidine (0.030 g, 0.150 mmol) in iPrOH (2 mL) was added a catalytic amount of concentrated H2 SO4 and the resulting mixture was heated in microwave at 100° C. for 45 min. The mixture was diluted with DCM, washed with 1 N NaOH and extracted with DCM. The combined organics were dried over Na2SO4, filtered, concentrated and chromatographed on silica gel using 0-4% MeOH/DCM to afford a light brown solid as (4S,6S)-4-(5-((7-chloropyrido[3,2-d]pyrimidin-4-yl)amino)-2-fluoro-3-methylphenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine (0.033 g, 0.068 mmol, 49.8% yield). MS m/z=486.9 [M+H]+. Calculated for C20H16ClF5N6O: 486.10.

Provenance & Evidence