Acetic Anhydride → N-(5-Fluoro-2-phenoxy-phenyl)-N-[2-(2-tosyloxy-ethoxy)-5-methoxy-benzyl]-acetamide

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Reaction Steps

To a solution of 5.75 g (10.7 mmol) crude 5b in 50 ml pyridine was added 4.37 g (42.8 mmol) acetic acid anhydride. The reaction mixture was stirred over night and poured into ice-cold ethyl acetate. The organic phase was washed with water and brine and were dried with magnesium sulfate. The crude product was purified by silica column chromatography (ethyl acetate:hexane gradient 1:8→1:4). The desired product 5c was obtained in 74.5% yield (4.62 g, 7.97 mmol).

Provenance & Evidence