Triethylamine → 1,1-Dimethylethyl 3-[5-(5-{3-chloro-4-[(2,2,2-trifluoroethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)-1-isoquinolinyl]propanoate

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Reaction Steps

A solution of 3-chloro-4-[(2,2,2-trifluoroethyl)oxy]benzoyl chloride (D21; 82 mg, 0.30 mmol) in dry DMF (1.5 ml) was added to a stirred solution of 1,1-dimethylethyl 3-{5-[(hydroxyamino)(imino)methyl]-1-isoquinolinyl}propanoate (D36; 85 mg, 0.270 mmol) and triethylamine (0.063 ml, 0.450 mmol) in dry DMF (1.5 ml) at 0° and the mixture was stirred at 0° for 1.5 h then at 100° with stirring under nitrogen for 16 h. The cooled mixture was partitioned between saturated aqueous sodium bicarbonate (30 ml) and ethyl acetate (3×20 ml), and the organic layer was washed with 50:50 brine:water and brine, dried (MgSO4) and evaporated in vacuo to give a brown oil (130 mg). The crude product was purified by flash chromatography on silica gel, eluting with 0-30% ethyl acetate-cyclohexane. The appropriate fractions were combined and evaporated in vacuo to give the title compound as a white solid (55 mg).

Provenance & Evidence