Water → 5-methyl-4-phenyl-2-(trifluoromethyl)-6H-1,3-oxazine-6-one
Reaction equation
[CH3:1][C:2](=[C:6]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)[NH:7][C:8](=[O:13])[C:9]([F:12])([F:11])[F:10])[C:3](O)=[O:4].O>C(OC(=O)C)(=O)C>[CH3:1][C:2]1[C:3](=[O:4])[O:13][C:8]([C:9]([F:12])([F:11])[F:10])=[N:7][C:6]=1[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
39.3 g of the product of Step B were refluxed in 80 ml of acetic anhydride and maintained at this temperature for 30 minutes and then allowed to cool. The acetic anhydride was expelled under reduced pressure and iced water was added to the residue. The precipitate obtained was separated, washed abundantly with water and then dissolved in ether. The organic solution was dried and concentrated to dryness under reduced pressure to obtain 34 g of the expected product melting at 70° C.