[CH2:1]([O:8][CH2:9][CH2:10][CH2:11][C:12]([OH:14])=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:15]([NH2:18])[CH2:16][CH3:17].C1C=CC2N(O)N=NC=2C=1.CN1CCOCC1.C(Cl)CCl>CN(C=O)C.C(OCC)(=O)C>[CH2:1]([O:8][CH2:9][CH2:10][CH2:11][C:12]([NH:18][CH2:15][CH2:16][CH3:17])=[O:14])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture of 4-benzyloxybutyric acid (2.69 g, 13.8 mmol), propylamine (0.82 g, 13.8 mmol), HOBt (2.05 g, 15.2 mmol), N-methylmorpholine (1.68 g, 16.6 mmol) and EDC (2.91 g, 15.2 mmol) in DMF (6 mL) is stirred at 20-25 degrees C. for 18 hours. The mixture is diluted with ethyl acetate (40 mL) and washed with water (10 mL), hydrochloric acid (1 N, 10 mL), saturated sodium bicarbonate (10 mL), and saline (10 mL). The organic phase is separated, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to provide 4-(benzyloxy)-N-propylbutanamide (2.59 g), APCI-MS (m/z) [M+H]+=236.
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