2-(dimethylamino)-4-(trifluoromethyl)-6H-1,3-oxazin-6-one → 3-(6-Fluoro-3-methyl-1,2-benzisoxazol-5-yl)-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione

Beteiligte Stoffe

Reaktionsschritte

A mixture of 5-amino-6-fluoro-3-methyl-1,2-benzisoxazole (4.85 g, 0.029 mol) and 2-dimethylamino-4-(trifluoromethyl)-6H-1,3-oxazin-6-one (6.70 g, 0.0320 mol) in acetic acid is refluxed for 90 minutes, cooled to room temperature, and poured into an ice-water mixture. The resultant aqueous mixture is filtered to obtain a solid. The solid is air-dried and dissolved in ethyl acetate. The resultant organic solution is washed with brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to give the title product as a yellow solid (7.00 g, mp 235-237° C.) which is identified by NMR spectral analyses.

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