Ammonium formate → 8-fluoro-4-methyl-3,4-dihydro-1,4-benzoxazepin-5(2H)-one

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Reaction Steps

A mixture of 9-chloro-8-fluoro-4-methyl-3,4-dihydro-1,4-benzoxazepin-5(2H)-one (1 equivalent), 10% palladium on charcoal (0.1 equivalents) and ammonium formate (10 equivalents) in methanol was heated at reflux for 2 hours. The mixture was allowed to cool, filtered through Celite® and the filtrate concentrated in vacuo. The residue was partitioned between ethyl acetate and water, the organic phase washed with brine, dried (MgSO4), concentrated in vacuo and chromatographed on alumina, eluting with ethyl acetate, to give the desired compound as a colourless solid.

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