Dicyclohexylcarbodiimide → 3-Fluoro-4-(2-methyloctanoyl) phenyl-3-fluoro-4-heptyloxy benzoic acid

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Reaction Steps

Into a flask were charged 1.2 g (4.76 mmol) of (+)-3-fluoro 4-(2-methyloctanoyl) phenol, 1.51 g (5.94 mmol) of 3-fluoro-4-heptyloxy benzoic acid, 76.7 mg (0.63 mmol) of N,N-dimethylamino pyridine and 30 ml of dried methylene chloride, which were slightly heated with stirring to form a homogeneous solution. Then, the solution was added with 1.40 g (6.79 mmol) of dicyclohexyl carbodiimide and stirred over a night. The precipitated white crystal was filtered off, and the resulting filtrate was washed with 2 normal hydrochloric acid, an aqueous solution of 5% sodium hydrogen carbonate and water in this order and dried on magnesium sulfate. After magnesium sulfate was filtered off, the filtrate was concentrated and dried under a reduced pressure to obtain an oil. This oil was purified through a column chromatography and recrystallized with ethanol to obtain 1.02 g (2.69 mmol, yield: 44%) of a white crystal of the objective compound having the aforementioned physical and chemical properties.

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