反应详情

4-[2-(2-Hydroxy-2-phenylethylamino)ethoxy]phenylacetamide hydrochloride (2.5 g) was heated under reflux in methanol (50 ml) containing concentrated sulphuric acid (1.5 ml) for 24 hours. The mixture was cooled and the solvent evaporated under reduced pressure. The residue was partitioned between dichloromethane (150 ml) and 5% NaHCO3 solution (150 ml). The organic layer was separated and washed successively with 5% NaHCO3 solution (20 ml) and water (20 ml), dried over MgSO4 and then the solvent was removed under reduced pressure. The residue was dissolved in methyl acetate (40 ml) and treated with a solution of ether saturated with hydrogen chloride. The precipitated solid was crystallised from a mixture of methanol and methyl acetate to give methyl 4-[2-(2-hydroxy-2-phenylethylamino)ethoxy]phenylacetate hydrochloride (1.8 g), m.p. 169°-171° C.; microanalysis: found C, 62.5; H, 6.6; N, 3.8; Cl, 9.7%; required for C19H24ClNO 4 : C, 62.4; H, 6.6; N, 3.8; Cl, 9.7%.

1. temperatureThe mixture was cooled
2. customthe solvent evaporated under reduced pressure
3. customThe residue was partitioned between dichloromethane (150 ml) and 5% NaHCO3 solution (150 ml)
4. customThe organic layer was separated
5. washwashed successively with 5% NaHCO3 solution (20 ml) and water (20 ml)
6. dry with materialdried over MgSO4
7. customthe solvent was removed under reduced pressure
8. dissolutionThe residue was dissolved in methyl acetate (40 ml)
9. additiontreated with a solution of ether saturated with hydrogen chloride
10. customThe precipitated solid was crystallised from a mixture of methanol and methyl acetate