反应详情

In a 15 ml vial was 6-bromo-7-phenyl-1H-pyrido[2,3-b][1,4]oxazine-2(3H)-thione (100 mg, 0.311 mmol) and hydrazine monohydrate (0.049 ml, 1.557 mmol) in tetrahydrofuran (5 ml) to give a brown solution. The reaction mixture was stirred at room temperature for 1 hour. The reaction mixture was concentrated under reduced pressure and the crude residue was slurred in diethyl ether. The supernatant solvent was removed and the brown solid vas dried until constant weigh to afford the title compound (90 mg, 90%). It was used for the next step without further purification. LCMS (Method D): RT 0.770 min, M+1=321.

1. customto give a brown solution
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customThe supernatant solvent was removed
4. customthe brown solid vas dried