Hydrochloric Acid → 3-(2-Methylbut-3-yn-2-yl)benzoic acid

Temperatur

60 °C

To a solution of methyl 3-(1,1-dimethylprop-2-yn-1-yl)benzoate (2.26 g, 11.2 mmol) in methanol (15 mL)/tetrahydrofuran (10 mL) was added 2N aqueous sodium hydroxide solution (11.2 mL, 22.4 mmol), and the mixture was stirred at 60° C. for 3 hr. 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 (100 mL, 20 mL). The combined organic layer was washed with saturated brine (10 and dried over anhydrous magnesium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was crystallized from ethyl acetate/hexane to give the title compound (1.94 g, 92%) as colorless crystals.

1. additionwas added
2. extractionthe mixture was extracted with ethyl acetate (100 mL, 20 mL)
3. washThe combined organic layer was washed with saturated brine (10
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 crystallized from ethyl acetate/hexane

ORD-Eintrag

ord-f87b3f276a424f2dba7663709638307f

Quelldatensatz

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08324395B2