Hydrochloric Acid → 8-(5-Fluoro-2-methylphenoxymethyl)-7-(4-hydroxy-2-methoxyphenyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

7-(4-Benzoyloxy-2-methoxyphenyl)-8-(5-fluoro-2-methylphenoxymethyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Compound No. 6-31, 422 mg, 0.761 mmol) was dissolved in mixed solvent of methanol (2 mL) and tetrahydrofuran (2 mL), and 4N aqueous sodium hydroxide solution (0.761 mL, 3.04 mmoL) was added thereto. After the reaction mixture was stirred at room temperature for 40 minutes, water (100 mL) and 1N aqueous HCl solution (4 mL) were added thereto. After the mixture was extracted with ethyl acetate mL), the organic layer was washed with water mL) and saturated brine (50 mL) successively, dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was filtered with a mixed solvent of hexane (10 mL) and ethyl acetate (10 mL) to give the titled compound (292 mg) as a colorless solid. (Yield 85%)

1. additionwas added
2. extractionAfter the mixture was extracted with ethyl acetate mL), the organic layer
3. washwas washed with water mL) and saturated brine (50 mL) successively
4. dry with materialdried over anhydrous magnesium sulfate
5. customthe solvent was removed under reduced pressure
6. filtrationThe obtained residue was filtered with a mixed solvent of hexane (10 mL) and ethyl acetate (10 mL)

ORD-Eintrag

ord-7b27528a978f4a3db86a20b8e815301e

Quelldatensatz

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08551991B2