Methanol → 4-Hydroxy-7-phenoxy-isoquinoline-3-carboxylic acid butyl ester

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Reaktionsschritte

A mixture of 208 mg of 1-Bromo-4-hydroxy-7-phenoxy-isoquinoline-3-carboxylic acid butyl ester (0.5 mmol), 49 mg of sodium acetate (0.6 mmol), 50 mg of 10 wt % palladium on charcoal, 10 ml of methanol, and 5 ml of ethyl acetate was stirred under hydrogen at 1 atm for 15 h. Then the mixture was filtered by suction through a pad of celite and was concentrated in vacuo. The residue was partitioned between 2 ml of half concentrated aqueous bicarbonate solution and 8 ml of ethyl acetate. The organic phase was dried over MgSO4. Evaporation in vacuo gave 130 mg of the title compound; 1H NMR (CDCl3): δ=11.89 (bs, 1H), 8.61 (s, 1H), 8.36 (d, 1H), 7.10 to 7.53 (m, 7H), 4.49 (t, 2H), 1.87 (m, 2H), 1.47 (m, 2H), 0.98 (t, 3H).

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