Methanol → 2-(3-(Benzo[c][1,2,5]oxadiazol-5-yl)-5-chloro-4-(cyclopropylmethoxy)phenyl)-4-methylpentanoic acid

To a stirred solution of ethyl 2-(3-(benzo[c][1,2,5]oxadiazol-5-yl)-5-chloro-4-(cyclopropylmethoxy)phenyl)-4-methylpentanoate (0.25 g, 0.565 mmol) in a mixture of THF (10 mL), methanol (10 mL) and water (5 mL) was added LiOH.H2O (118.7 mg, 2.828 mmol) at room temperature and the mixture was stirred at RT for 2 h. After complete consumption of starting material as monitored by TLC, the reaction mixture was diluted with water (10 mL) and acidified using 1 N HCl at 0° C. The aqueous layer was extracted with EtOAc (2×20 mL); combined organic extracts were washed with water (10 mL), brine (20 mL), dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The crude material was purified by column chromatography to afford compound 2-(3-(benzo[c][1,2,5]oxadiazol-5-yl)-5-chloro-4-(cyclopropylmethoxy)phenyl)-4-methylpentanoic acid (152 mg) as an off white solid. 1HNMR (500 MHz) (CDCl3): δ (ppm) 7.92 (s, 1H), 7.85 (m, 1H), 7.72 (m, 1H), 7.46 (s, 1H), 7.25 (s, 1H), 3.65 (t, 1H), 3.48 (d, 2H), 1.95 (m, 1H), 1.65 (m, 1H), 1.55 (m, 1H), 1.22 (m, 1H0, 0.93 (d, 6H), 0.39 (d, 2H), 0.0 (m, 2H).

1. customAfter complete consumption of starting material
2. additionthe reaction mixture was diluted with water (10 mL)
3. customat 0° C
4. extractionThe aqueous layer was extracted with EtOAc (2×20 mL)
5. washcombined organic extracts were washed with water (10 mL), brine (20 mL)
6. dry with materialdried over anhydrous Na2SO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe crude material was purified by column chromatography

ORD record

ord-1df25e6ce20a4fa2b4900b52d3f723ac

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08367863B2