Lactonitrile → (+/-)-2-(Benzo[1,3]dioxol-5-yloxy)-N-[4-(1-cyano-ethoxy)-2-fluoro-benzyl]-nicotinamide

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To a stirred solution of 2-(benzo[1,3]dioxol-5-yloxy)-N-(2-fluoro-4-hydroxy-benzyl)-nicotinamide (5 g, 13.1 mmol), (+/−)-lactonitrile (0.93 g, 13.1 mmol) and triphenylphosphine (3.78 g, 14.4 mmol) in tetrahydrofuran (200 mL) at room temperature, diethyl azodicarboxylate (2.3 mL, 14.4 mmol) was added dropwise with stirring. The mixture was stirred at room temperature overnight. Solvents were stripped in vacuo, diluted with ethyl acetate and washed with dilute aqueous sodium hydroxide, brine, and dried (MgSO4). Solvents were stripped in vacuo. The resulting oil was washed with diethyl ether and the precipitate was filtered off. The mother liquor was purified by flash column chromatography (35% ethyl acetate/hexane), affording 1.5 g white solid (26% yield).

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