6-fluoro-2,3-dihydro-1H-indol-2-one → 3-(4-bromo-5H-furan-2-ylidene)-6-fluoro-1,3-dihydro-indol-2-one

温度

0 °C

To a 0° C. stirred solution of 6-fluorooxindole (370 mg, 2.45 mmol) in anhydrous THF (10 mL) was added 1M LiHMDS/THF solution (4.9 mL, 4.9 mmol). The mixture was stirred at 0° C. for 10 minutes. 4-Bromo-5H-furan-2-one (200 mg, 1.23) was added as a solution in 2 mL of THF. The resulting mixture was stirred at 0° C. for 30 minutes, then at room temperature for 1 hour and quenched with 10 mL of 2M HCl. Methanol (5 mL) was added and the mixture was stirred at 50° C. for 0.5 hour. The mixture was poured into 150 mL of water and then stirred for 30 minutes. The precipitates were filtered, washed with water, and dried in vacuum to give 3-(4-bromo-5H-furan-2-ylidene)-6-fluoro-1,3-dihydro-indol-2-one as a yellow solid. Yield: 228 mg, 63%.

1. stirringThe resulting mixture was stirred at 0° C. for 30 minutes
2. waitat room temperature for 1 hour
3. customquenched with 10 mL of 2M HCl
4. additionMethanol (5 mL) was added
5. stirringthe mixture was stirred at 50° C. for 0.5 hour
6. additionThe mixture was poured into 150 mL of water
7. stirringstirred for 30 minutes
8. filtrationThe precipitates were filtered
9. washwashed with water
10. customdried in vacuum

ORDレコード

ord-3bb8a73c97074de1b49c3cccdef658fb

出典データセット

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08877923B2