反应详情

To a solution of ethyl (±)-4-(4-carboxy-1,3-oxazol-2-yl)-3-phenylbutanoate (100 mg, 0.33 mmole) in CH2Cl2 (2 mL) was added 1,1′-carbonyldiimidazole (80 mg, 0.49 mmole). After 2 hr, Et3N (0.14 mL, 0.98 mmole) and 2-[(3-amino-1-propyl)amino]pyridine dihydrochloride (110 mg, 0.49 mmole) were added. After 4 h, the mixture was concentrated under reduced pressure. The residue was chromatographed on silica gel (75% EtOAc/hexanes) to give the title compound (131 mg, 91%) as a yellow oil: MS (ES) m/e 437 (M+H)+.

1. waitAfter 4 h
2. concentrationthe mixture was concentrated under reduced pressure
3. customThe residue was chromatographed on silica gel (75% EtOAc/hexanes)