Hydrochloric Acid → 6-[(4-fluorophenyl)methyl]-4-hydroxy-N,N-dimethyl-3,5-dioxo-7,8-dihydro-2H-2,6-naphthyridine-1-carboxamide

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Reaction Steps

To a cooled (−10° C.) solution of dimethylamine (2M in THF, 0.002 g, 0.035 mmol) was slowly added trimethylaluminum (2M in toluene, 0.002 g, 0.035 mmol) and stirred for 30 minutes at room temperature. The reaction mixture was cooled to −10° C. and methyl 6-(4-fluorobenzyl)-4-hydroxy-3,5-dioxo-2,3,5,6,7,8-hexahydro-2,6-naphthyridine-1-carboxylate (0.004 g, 0.012 mmol, Example 1, Step 8) in THF (5 mL) was added. The reaction stirred at room temperature for 2 hours, then transferred via syringe to a solution of 1:1 CH2Cl2:0.5 N aq. HCl at 0° C. and stirred for 1 hour. The product mixture was separated, and the aqueous was extracted three times with CH2Cl2. The aqueous layer was treated with saturated Na2CO3 solution to pH 5 and extracted three times with CH2Cl2 again. The organic combined extracts were dried with Na2SO4 and concentrated under vacuum. The residue was purified by reverse phase HPLC eluting with 5%-95% acetonitrile (0.1% TFA) in H2O (0.1% TFA) to afford the title compound as a light yellow solid.

Provenance & Evidence