2-(4-氟苯基)环己酮 、
N-(氯甲酰)异氰酸酯 以to provide 8-(4-fluorophenyl)-5,6,7,8-tetrahydro-2H-benzo[e][1,3]oxazine-2,4(3H)-dione (415.0 mg, 1.689 mmol, 19.62% yield) as white solid and 4a-(4-fluorophenyl)-4a,5,6,7-tetrahydro-2H-benzo[e][1,3]oxazine-2,4(3H)-dione (746.4 mg, 3.04 mmol, 35.3% yield) as white solid的产率得到8-(4-fluorophenyl)-5,6,7,8-tetrahydro-2H-benzo[e][1,3]oxazine-2,4(3H)-dione