Dichloromethane → 4-Benzyloxy-1-methoxy-isoquinoline-3-carboxylic acid butyl ester

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A mixture of 4-benzyloxy-1-hydroxy-isoquinoline-3-carboxylic acid butyl ester (1 eq.), Me3OBF4 (6 eq), KHCO3 (14 eq) and CH2Cl2 (10 ml/mmol 4-benzyloxy-1-hydroxy-isoquinoline-3-carboxylic acid butyl ester) was stirred at ambient temperature for 24 h. Then water (10 ml/mmol) was added and the mixture was extracted with CH2Cl2 (40 ml/mmol). The organic phase was separated, dried over MgSO4 and evaporated in vacuo to give a yellowish solid. The crude product was purified by flash column chromatography on silica gel using hexanes:EtOAc=85:15 as the eluent. Evaporation of the first fraction gave the title compound as a colorless oil in 20% yield; 1H NMR (CDCl3): δ=8.21 to 8.25 (m, 1 H), 8.05 to 8.09 (m, 1 H), 7.33 to 7.73 (m, 7 H), 5.13 (s, 2 H), 4.38 (t, 2 H), 4.16 (s, 3 H), 1.69 (m, 2 H), 1.37 (m, 2 H), 0.94 (t, 3 H).

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