反应详情

A solution of 4-(5-chloro-1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine methyl ester hydrochloride (47.4 mg, 0.25 mmol), 1-(2-methoxyethyl)cyclopentane carboxylic acid (47 mg, 0.28 mmol), DIEA (175 μL, 1.0 mmol) and HBTU (133 mg, 0.35 mmol) in DMF (3 mL) was stirred at room temperature for 4 hr. The mixture was concentrated, the residue was dissolved in ethyl acetate (15 mL), was washed with 0.5 N HCl (1×5 mL), sat. NaHCO3 (1×5 mL), brine (1×5 mL) and was dried (MgSO4). The residue obtained upon evaporation was chromatographed on 25 g of silica gel, eluting with ethyl acetate to give 4-(5-chloro-1-methyl-2-oxo-3-pyridinyl)-N-[[1-(2-methoxyethyl)cyclopentyl]carbonyl]-L-phenylalanine methyl ester (70.5 mg, 59%). LR-Electrospray: m/z positive ion, 943 (2M+Na), 483 (M+Na), 478, (M+NH4), 461 (M+H); negative ion 919 (2M−H), 521, 459 (M−H).

1. concentrationThe mixture was concentrated
2. dissolutionthe residue was dissolved in ethyl acetate (15 mL)
3. washwas washed with 0.5 N HCl (1×5 mL), sat. NaHCO3 (1×5 mL), brine (1×5 mL)
4. dry with materialwas dried (MgSO4)
5. customThe residue obtained upon evaporation
6. customwas chromatographed on 25 g of silica gel
7. washeluting with ethyl acetate