tert-Butanol → HCID 66789903, compound

A mixture of palladium acetate (1.3 mg), 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl (7.2 mg), phenylboronic acid (0.9 mg) and tert-butanol (2 mL) was stirred at room temperature for 20 minutes under argon atmosphere. To the reaction mixture were added N-[4-(3-chloro-4-fluorophenyl)-2,2-dimethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl]methanesulfonamide (compound obtained in Example 13, 60 mg), potassium carbonate (62 mg), tert-butyl carbamate (35 mg) and tert-butanol (5 mL), and the mixture was refluxed for 3 hours. To the reaction mixture were further added palladium acetate (1.3 mg), 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl (7.2 mg), potassium carbonate (62 mg) and tert-butyl carbamate (35 mg), and the mixture was further refluxed for 20 hours. After cooling, the reaction mixture was diluted with ethyl acetate, and the mixture was washed successively with water and brine, dried over sodium sulfate and concentrated in vacuo. The resultant residue was purified by column chromatography on silica gel (solvent; n-hexane/ethyl acetate =4/1→3/7) to give tert-butyl (5-{2,2-dimethyl-7-[(methylsulfonyl)amino]-3-oxo-2,3-dihydro-4H-1,4-benzoxazin-4-yl}-2-fluorophenyl)-carbamate (83 mg) as a colorless powder.

1. temperaturethe mixture was refluxed for 3 hours
2. temperaturethe mixture was further refluxed for 20 hours
3. temperatureAfter cooling
4. washthe mixture was washed successively with water and brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated in vacuo
7. customThe resultant residue was purified by column chromatography on silica gel (solvent; n-hexane/ethyl acetate =4/1→3/7)

ORD record

ord-b95002f3e6604a90a0bbee89eca4360b

Source dataset

uspto-grants-2011_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07998956B2