Pyridine → (1S,2S)-2-[4-((R)-7-Fluoro-4-phenoxy-indan-1-yloxy)-phenyl]-cyclopropanecarboxylic acid

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Reaction Steps

(1S,2S)-2-[4-((R)-7-Fluoro-4-hydroxy-indan-1-yloxy)-phenyl]-cyclopropanecarboxylic acid ethyl ester (Intermediate 5, 150 mg, 0.42 mmol), pyridine (dry; 0.133 mL, 1.68 mmol) and phenylboronic acid (308 mg, 2.53 mmol) are suspended in dichloromethane (10 mL), 4 Å molecular sieves and copper(II)acetate (153 mg, 1.52 mmol) are added and the mixture is stirred under oxygen atmosphere at room temperature for 20 h. NH4OH (2 M aqueous solution, 20 mL) is added and the mixture is extracted with dichloromethane. The organic phase is collected, dried over sodium sulfate and concentrated under vacuum. The crude product is purified by flash chromatography (10-100% ethyl acetate in cyclohexane) to give the title compound (Yield: 40 mg). LC (METHOD 9): tR=2.52 min; Mass spectrum (ES+): m/z=405 [M+H]+.

Provenance & Evidence