Triethylamine → 7-{4-[4-(2,3-Dichloro-phenyl)-piperazin-1-yl]-butoxy}-5-methyl-3,4-dihydro-1H-[1,8]naphthyridin-2-one

Beteiligte Stoffe

Reaktionsschritte

To a suspension of 1-(2,3-dichloro-phenyl)-piperazine hydrochloride (0.93 g, 3.48 mmol) in dichloroethane (10 mL) was added Et3N (0.96 mL, 6.92 mmol). The mixture was stirred for 15 min and a suspension of 4-(4-methyl-7-oxo-5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yloxy)-butyraldehyde (0.86 g, 3.46 mmol) in dichloroethane (5 mL) was added. After 20 min at RT, NaBH(OAc)3 (1.03 g, 4.85 mmol) was added and the reaction was stirred at room temperature for 4 h. The reaction mixture was poured into CH2Cl2 and washed with H2O, 1N citric acid, saturated NaHCO3 and brine, dried over Na2SO4 and concentrated to an oil. Et2O was added and the organics were decanted from an insoluble gum. The filtrate yielded a crystalline solid, which was collected by filtration and dried. Purification by liquid chromatography (gradient elution, 100% CHCl3 to 2% MeOH/CHCl3, Biotage 40m column) provided the title compound as a white solid (1.12 g, 2.44 mmol, 70%). MS: APCI: M+1: 463.1 (Exact Mass: 462.16).

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