反应详情

3-[(2-Acetylthiomethyl-3-phenylpropionyl)amino]-5-methylbenzoic acid (compound of Example 1) (1.7 g) is dissolved in methanol (9 ml), and thereto is added 1N aqueous sodium hydroxide solution (9 ml) under nitrogen, and the mixture is stirred at room temperature for 30 minutes. The reaction mixture is adjusted to pH 1 by adding dropwise conc. hydrochloric acid, and the residue is purified by a medium pressure column chromatography with CHP-20P (eluant, water-acetonitrile). The fractions containing the desired compound are collected and concentrated into dryness under reduced pressure to give the title compound (0.9 g).

1. customthe residue is purified by a medium pressure column chromatography with CHP-20P (eluant, water-acetonitrile)
2. additionThe fractions containing the desired compound
3. customare collected
4. concentrationconcentrated into dryness under reduced pressure