Sodium Hydroxide → 4-[2-(2-Carboxy-ethyl)-3-[6-(-4'-methanesulfonyl-5-methoxymethyl-biphenyl-3-yloxy)-hexyl]-phenoxy]-butyric acid

To a solution of the 4-{2-(2-ethoxycarbonyl-ethyl)-3-[6-(4′-methanesulfonyl-5-methoxymethyl-biphenyl-3-yloxy)-hexyl]-phenoxy}-butyric acid ethyl ester (195 mg, 0.29 mmol) in THF (5 mL) and ethanol (5 mL) was added aqueous 1.0 N sodium hydroxide (3 mL) at room temperature. The resulting suspension was stirred for 5 h at room temperature at which time TLC analysis of the mixture indicated the absence of starting material. Then, the reaction mixture was concentrated and the residue was diluted with water (20 mL) and extracted with diethyl ether (30 mL) to remove any neutral impurities. The aqueous layer was acidified with 1.0 N hydrochloric acid and the precipitated white organic compound was extracted into ethyl acetate (2×30 mL). The combined ethyl acetate extracts were washed with brine solution (50 mL) and the organic layers were dried over anhydrous magnesium sulfate. Filtration of the drying agent and removal of the solvent afforded 4-[2-(2-carboxy-ethyl)-3-[6-(-4′-methanesulfonyl-5-methoxymethyl-biphenyl-3-yloxy)-hexyl]-phenoxy]-butyric acid (168 mg, 94%) as a white solid: ES(+)-HRMS m/e calcd for C34H42O9S (M+Na)+ 649.2442. found 649.2440.

1. concentrationThen, the reaction mixture was concentrated
2. additionthe residue was diluted with water (20 mL)
3. extractionextracted with diethyl ether (30 mL)
4. customto remove any neutral impurities
5. extractionthe precipitated white organic compound was extracted into ethyl acetate (2×30 mL)
6. washThe combined ethyl acetate extracts were washed with brine solution (50 mL)
7. dry with materialthe organic layers were dried over anhydrous magnesium sulfate
8. filtrationFiltration of the drying agent and removal of the solvent

ORD record

ord-f3b25355a0b543b88a1bf171254a2f33

Source dataset

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08088936B2