反应详情

To a mixture of tert-butyl 7-bromo-4-oxo-3,4-dihydroquinoline-1(2H)-carboxylate (0.500 g, 1.53 mmol) and morpholine (0.668 mL, 7.66 mmol) in toluene (10 mL) at 0° C. was added titanium(IV) chloride [1M in toluene] (0.843 mL, 0.843 mmol) dropwise. The ice-bath was removed, and the orange, heterogeneous reaction mixture was stirred at room temperature overnight. The heterogeneous, orange reaction mixture was filtered under reduced pressure through a pad of Celite which was then rinsed with toluene (3×10 mL). The pale yellow filtrate was concentrated under reduced pressure to give tert-butyl 7-bromo-4-morpholinoquinoline-1(2H)-carboxylate (0.598 g, 1.513 mmol, 99% yield) as a yellow oil. The product had LC/MS M+1=395.1 and 397.1.

1. customThe ice-bath was removed
2. filtrationThe heterogeneous, orange reaction mixture was filtered under reduced pressure through a pad of Celite which
3. washwas then rinsed with toluene (3×10 mL)
4. concentrationThe pale yellow filtrate was concentrated under reduced pressure