Potassium Hydroxide → 3(S)-hydroxy-2-methylene-3-phenylpropanoic Acid

A solution of potassium hydroxide (2.27 g, 0.040 mol, 1.3 eq) in water (45 mL) was added drop wise to a solution of 1a (6 g, 0.031 mol, 1 eq) in methanol (15 mL) (see FIG. 4). The mixture was stirred at room temperature for 15 h. The solution was then concentrated under vacuum. The aqueous phase was washed with ether (2×100 mL), acidified with 6N aqueous HCl solution and extracted with ether (3×100 mL). The combined organic extracts were washed with brine (100 mL) and dried over sodium sulfate. Evaporation of the solvent afforded a colorless oil which crystallized upon standing. The desired product 9a was obtained as a solid (5.34 g, 96%). Rf 0.26 (hexane/EtOAc=6:4).). 1H NMR δ (DMSO-d6) 5.41 (s, 1H), 5.61 (s, 1H), 5.93 (s, 1H), 6.15 (s, 1H), 7.22 (m, 5H), 12.45 (s, 1H). [MH]− 177.2: tR=1.28 min; purity: 88%.

1. concentrationThe solution was then concentrated under vacuum
2. washThe aqueous phase was washed with ether (2×100 mL)
3. extractionextracted with ether (3×100 mL)
4. washThe combined organic extracts were washed with brine (100 mL)
5. dry with materialdried over sodium sulfate
6. customEvaporation of the solvent
7. customafforded a colorless oil which
8. customcrystallized

ORD record

ord-436c01d792854a81a420b18e82f41e2c

Source dataset

uspto-grants-2004_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06794510B2