Hydrochloric Acid → 3-(1-Cyano-1-methylethoxy)benzoic acid

To a solution of methyl 3-(1-cyano-1-methylethoxy)benzoate (2.07 g, 9.44 mmol) in methanol (12 mL)/tetrahydrofuran (4 mL) was added 2N aqueous sodium hydroxide solution (9.44 mL, 18.9 mmol), and the mixture was stirred at room temperature for 30 min. The reaction mixture was neutralized with 6N hydrochloric acid (5 mL), 1N hydrochloric acid (50 mL) was added, and the mixture was extracted with ethyl acetate (50 mL, 20 mL). The combined organic layer was washed with saturated brine (10 mL), and dried over anhydrous magnesium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=90/10→50/50), and the fraction containing the object product was concentrated under reduced pressure. The obtained residue was crystallized from ethyl acetate/hexane to give the title compound (1.01 g, 51%) as colorless crystals.

1. additionwas added
2. extractionthe mixture was extracted with ethyl acetate (50 mL, 20 mL)
3. washThe combined organic layer was washed with saturated brine (10 mL)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationThe insoluble material was filtered off
6. concentrationthe filtrate was concentrated under reduced pressure
7. customThe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=90/10→50/50)
8. additionthe fraction containing the object product
9. concentrationwas concentrated under reduced pressure
10. customThe obtained residue was crystallized from ethyl acetate/hexane

ORDレコード

ord-fda523dd24194a398c692f0f05e24e50

出典データセット

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08324395B2