反应详情

To a solution of (2R)-2-((3S)-3-{[(6-chloro-2-naphthyl)sulfonyl]amino}-2-oxopyrrolidin-1-yl)propanoic acid [Intermediate 28] (0.037 g) in DCM (1.0 ml) were added 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (0.036 g), HOBT (0.025 g) and triethylamine (0.026 ml) and the mixture was stirred at room temperature for 5 min. Morpholine (0.012 ml) was added and the resultant mixture stirred at room temperature for 15.5 h. The mixture was partitioned between DCM and saturated sodium bicarbonate solution and then passed through a hydrophobic frit. The organic extract was concentrated under reduced pressure and the residue was partially purified using preparative thin layer chromatography (20 cm×20 cm 1 mm thick Whatman PKF256 SiO2 plate, eluting with hexane:ethyl acetate 1:5) to give an impure sample of the title compound. This sample was repurified using preparative thin layer chromatography (20 cm×20 cm 1 mm thick Whatman PKF256 SiO2 plate, eluting with hexane:ethyl acetate 1:8) to give the title compound (0.036 g) as a white solid.

1. customThe mixture was partitioned between DCM and saturated sodium bicarbonate solution
2. extractionThe organic extract
3. concentrationwas concentrated under reduced pressure
4. customthe residue was partially purified
5. washthin layer chromatography (20 cm×20 cm 1 mm thick Whatman PKF256 SiO2 plate, eluting with hexane:ethyl acetate 1:5)