反应详情

Ethyl 3-[(2-acetylthiomethyl-3-phenylpropionyl)-amino]benzoate (compound of Example 68-(a)-[1]) (2.0 g) is dissolved in a 80% aqueous acetonitrile, and thereto is added pyrrolidine (0.5 g), and the mixture is stirred at room temperature for 30 minutes. The mixture is adjusted to pH 5.0 with 10% hydrochloric acid, and acetonitrile is distilled off under reduced pressure, and the residue is extracted with ethyl acetate (50 ml). The extract is washed with water, and ethyl acetate is distilled off under reduced pressure. 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 acetonitrile is distilled off under reduced pressure. The aqueous solution is extracted with ethyl acetate (50 ml), and the extract is dried over anhydrous magnesium sulfate, and ethyl acetate is distilled off under reduced pressure to give the title compound (0.5 g) as an oily substance. IR (film; cm-1): 1710, 1660 Elementary analysis for C19H21NO3S: Calcd. (%): C,66.45; H,6.16; N,4.08; S,9.34 Found (%): C,66.37; H,6.25; N,4.04; S,9.05

1. distillationis distilled off under reduced pressure
2. extractionthe residue is extracted with ethyl acetate (50 ml)
3. washThe extract is washed with water, and ethyl acetate
4. distillationis distilled off under reduced pressure
5. customThe residue is purified by a medium pressure column chromatography with CHP-20P (eluant, water-acetonitrile)
6. additionThe fractions containing the desired compound
7. customare collected
8. distillationacetonitrile is distilled off under reduced pressure
9. extractionThe aqueous solution is extracted with ethyl acetate (50 ml)
10. dry with materialthe extract is dried over anhydrous magnesium sulfate, and ethyl acetate
11. distillationis distilled off under reduced pressure