反应详情

1.52 g of lithium hydroxide are added to a solution, cooled to +5° C., of 4.1 g of (4S,5S)-4-methyl5-phenyl-3-[(S)-2-(2-methoxyphenyl)propionyl]2-oxazolidinone in 60 cm3 of tetrahydrofuran and 30 cm3 of water. The reaction mixture is stirred for 3 hours at this temperature and then, after returning to room temperature, ethyl acetate is added, the mixture decanted, the aqueous phase is acidified with a 1N aqueous solution of hydrochloric acid, extracted with ethyl acetate and the organic phase is dried over magnesium sulphate and concentrated to dryness under reduced pressure (2.7 kPa). The solid obtained is recrystallized from hexane, drained and dried. 0.4 g of (S)-2-(2-methoxyphenyl)propionic acid is obtained in the form of white crystals; melting point 102° C. [α]D20 =+84.6; (c=1; CHCl3).

1. customafter returning to room temperature
2. customthe mixture decanted
3. extractionextracted with ethyl acetate
4. dry with materialthe organic phase is dried over magnesium sulphate
5. concentrationconcentrated to dryness under reduced pressure (2.7 kPa)
6. customThe solid obtained
7. customis recrystallized from hexane
8. customdried