1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 6-{(1E)-3-[3-(Benzyloxy)azetidin-1-yl]-3-oxoprop-1-en-1-yl}-3,4-dihydro-1,8-naphthyridin-2(1H)-one

Participants

Reaction Steps

A 16 mL vial flask was successively charged with (2E)-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylic acid hydrochloride (60 mg, 0.24 mmol), DMF (5.8 mL), 3-(benzyloxy)azetidine hydrochloride (58 mg, 0.29 mmol; which may be prepared as described in Step 2), DIPEA (96 μL, 0.58 mmol), DMAP (2.4 mg, 0.02 mmol) and EDAC (56 mg, 0.29 mmol). The reaction mixture was stirred at room temperature overnight and concentrated to dryness. The residue was purified by precipitation in MeOH/H2O and then triturated in acetone/diethyl ether to give the title compound as a beige solid (33 mg, 38%).

Provenance & Evidence