反应详情

温度

90 °C

A 250-mL round-bottom flask was charged with 3-((9-amino-7-bromo-4-fluoro-2-methoxy-9H-xanthen-9-yl)methoxy)propanenitrile (2.78 g, 6.83 mmol) and toluene (45.5 mL) to give a pale-green solution. Trimethylaluminum (7.17 mL of a 2M solution in toluene, 14.34 mmol) was added, and a reflux condenser was attached. After stirring for 1 min, the flask was heated to 90° C. for 1 h. After this time, the mixture was cooled to RT. Sodium sulfate decahydrate (3.4 g) was added slowly over 5 min, and the mixture was stirred overnight. In the morning, the mixture was diluted with EtOAc (50 mL) and filtered through celite. The filter pad was washed with EtOAc (3×50 mL). The combined filtrates were concentrated to give a pale-yellow solid. The crude product was purified by chromatography on silica gel (0-10% MeOH/DCM) to give (E)-7′-bromo-4′-fluoro-2′-methoxy-6,7-dihydro-2H-spiro[[1,4]oxazepine-3,9′-xanthen]-5-amine as a white solid. 1H NMR (400 MHz, DMSO-d6) δ=7.53 (d, J=2.4 Hz, 1 H), 7.47 (dd, J=2.5, 8.6 Hz, 1 H), 7.18 (d, J=8.6 Hz, 1 H), 6.95 (dd, J=2.9, 12.3 Hz, 1 H), 6.69 (dd, J=1.5, 2.9 Hz, 1 H), 6.15 (br. s., 2 H), 3.83-3.69 (m, 5 H), 3.64-3.45 (m, 2 H), 3.00-2.74 (m, 2 H). MS m/z=411.0. Calc'd for C18H17BrFN2O3: 407.1.

1. customto give a pale-green solution
2. customa reflux condenser was attached
3. temperatureAfter this time, the mixture was cooled to RT
4. stirringthe mixture was stirred overnight
5. filtrationfiltered through celite
6. washThe filter pad was washed with EtOAc (3×50 mL)
7. concentrationThe combined filtrates were concentrated
8. customto give a pale-yellow solid
9. customThe crude product was purified by chromatography on silica gel (0-10% MeOH/DCM)