4-Methoxypiperidine → N-(3-((4S,6S)-2-benzamido-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-4-yl)-4-fluorophenyl)-4-methoxypiperidine-1-carboxamide

Participants

Reaction Steps

To a cooled (0° C.) solution of N-((4S,6S)-4-(5-amino-2-fluorophenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-yl)benzamide (4l, 0.200 g, 0.506 mmol) in dichloromethane (4 mL) was added 4-nitrophenyl chloroformate (0.111 g, 0.551 mmol) as a solid. After 10 min the reaction was allowed to warm to room temperature. After 3 h 4-methoxy-piperidine (0.100 mL, 1.036 mmol) was added dropwise via syringe and the reaction was stirred overnight. The reaction was evaporated onto silica gel and purified by flash chromatography (Isco, 25 g) eluting with (25% EtOH/EtOAc):hexanes (0:1→2:3) to give N-(3-((4S,6S)-2-benzamido-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-4-yl)-4-fluorophenyl)-4-methoxypiperidine-1-carboxamide (166 mg. 61% yield) of a clear, colorless tar. MS m/z=537 [M+H]+. Calculated for C26H28F4N4O4: 536

Provenance & Evidence