Sulfuric Acid → HCID 86732274, compound

Participants

Reaction Steps

To a solution of (4S,6S)-4-(2-chloro-3-fluorophenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine (1.06 g, 3.41 mmol) in sulfuric acid (13.64 ml, 256 mmol) cooled in an ice bath was added potassium nitrate (0.448 g, 4.44 mmol) in one portion. After stirred for 15 min, ice bath was removed, and the mixture was stirred at room temperature for 40 min. The reaction mixture was poured into ice water containing sodium carbonate (40 g). The resulted suspension was extracted with EtOAc. The organic layer was washed with brine, dried over sodium sulfate and filtered. The filtrate was concentrated and dried in vacuum to afford the crude (4S,6S)-4-(2-chloro-3-fluoro-5-nitrophenyl)-4-methyl-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine as a light yellow solid, which was used in next step without purification. MS m/z=356 [M+H]+. Calculated for C12H10ClF4N3O3: 355.6.

Provenance & Evidence