反应详情

6-Methoxy-[1,5]naphthyridine-3-carboxylic acid (100 mg, 0.44 mmol, 1.0 eq) is added at room temperature to a stirred solution of trans-{4-[(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-amino]-cyclohexyl}-methanol (129 mg, 0.44 mmol, 1.0 eq) in N,N-dimethylformamide (4 mL), followed by N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (93 mg, 0.48 mmol, 1.10 eq) and 4-(dimethylamino)pyridine (81 mg, 0.66 mmol, 1.50 eq). After 15 hours stirring at room temperature, solvent is evaporated and the residue is extracted with dichloromethane (3×10 mL) and water (10 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a residue that is purified by preparative HPLC to afford 6-methoxy-[1,5]naphthyridine-3-carboxylic acid trans-4-[(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-amino]-cyclohexylmethyl ester as an off-white semisolid (33 mg, 15% yield).

1. customsolvent is evaporated
2. extractionthe residue is extracted with dichloromethane (3×10 mL) and water (10 mL)
3. dry with materialThe combined organic layers are dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customto give a residue that
7. customis purified by preparative HPLC