1,8-Diazabicyclo(5.4.0)undec-7-ene → (4S,6S)-4-(5-amino-2-fluorophenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine

Participants

Reaction Conditions

Reaction Steps

A microwave vial was charged with a solution of crude N-((4S,6S)-4-(5-amino-2-fluorophenyl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-yl)benzamide (1k, 0.561 g, 1.357 mmol, Example 1 step 9) in MeOH (9 mL). 1,8-diazabicyclo[5.4.0]undec-7-ene (1.653 g, 10.86 mmol, Aldrich) was added and the vial was sealed. The reaction was heated to 80° C. in a microwave (Biotage Initiator) for a total of 135 minutes. The reaction was concentrated under reduced pressure. The crude material was taken up in EtOAc and washed with water (3×). The organic layer was extracted with 1N HCl (two times). The acidic aqueous layer was washed with EtOAc (twice). The acidic aqueous layer was basified with 5N NaOH to pH=12 and back extracted with EtOAc (twice). The organic layer was washed with brine, dried over magnesium sulfate and concentrated under reduced pressure to afford the crude title compound as a grey oil (0.345 g, 1.116 mmol, 82% crude yield) which was used in the next step without further purification. MS m/z=310.0 [M+H]+. Calculated for C12H12F5N3O: 309.235

Provenance & Evidence