Cesium carbonate → (1S,2S)-2-{4-[(R)-4-(4-Cyano-phenoxy)-7-fluoro-indan-1-yloxy]-phenyl}-cyclopropanecarboxylic acid ethyl ester

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Reaction Conditions

Reaction Steps

(1S,2S)-2-[4-((R)-7-Fluoro-4-hydroxy-indan-1-yloxy)-phenyl]-cyclopropanecarboxylic acid ethyl ester (Intermediate 5, 146 mg, 0.41 mmol), 4-fluorobenzonitrile (55 mg, 0.45 mmol), and cesium carbonate (145 mg, 0.45 mmol) are suspended in dry dimethylformamide (10 mL) and stirred for 3 hours at 100° C. followed by room temperature overnight. The mixture is diluted with water and extracted with ethyl acetate. The organic extract is dried over sodium sulfate, filtered and the solvent removed. The residue is purified by flash chromatography (10% ethyl acetate in cyclohexane) to give the title compound (Yield 62 mg). LC (METHOD 5): tR=1.54 min; Mass spectrum (ES+): m/z=458 [M+H]+.

Provenance & Evidence