Sodium Hydroxide → 3-Cyclopentyl-2-[3-fluoro-4-(5-methyl-tetrazol-1-yl)-phenyl]-propionic acid

Temperatur

47.5 °C

A solution of 3-cyclopentyl-2-[3-fluoro-4-(5-methyl-tetrazol-1-yl)-phenyl]-propionic acid methyl ester (400 mg, 1.2 mmol) in ethanol (8 mL) was treated with a 1N aqueous sodium hydroxide solution (2.5 mL). The solution was heated at 45-50° C. for 5 h, at which time, thin layer chromatography analysis of the reaction mixture indicated the absence of starting material. The reaction mixture was concentrated in vacuo to remove ethanol. The residue was diluted with water (40 mL) and extracted with diethyl ether (1×50 mL) to remove any neutral impurities. The aqueous layer was then acidified with a 1N aqueous hydrochloric acid solution, and the resulting acid was extracted into ethyl acetate (2×50 mL). The combined organic layers were washed with a saturated aqueous sodium chloride solution (1×50 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-[3-fluoro-4-(5-methyl-tetrazol-1-yl)-phenyl]-propionic acid (360 mg, 94%) as a yellow solid: EI-HRMS m/e calcd for C16H19FN4O2 (M+) 318.1487, found 318.1492.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customto remove ethanol
3. additionThe residue was diluted with water (40 mL)
4. extractionextracted with diethyl ether (1×50 mL)
5. customto remove any neutral impurities
6. extractionthe resulting acid was extracted into ethyl acetate (2×50 mL)
7. washThe combined organic layers were washed with a saturated aqueous sodium chloride solution (1×50 mL)
8. dry with materialdried over anhydrous magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo

ORD-Eintrag

ord-1dffc024994f4f4f9c9982c06f696b7a

Quelldatensatz

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06441180B1