Acetone → N-(3-chlorophenyl)-2-(2,3-dihydro-6-iodomethyl-4-oxo-5-phenyl-4H-2,3-oxazin-3-yl)-2-methylpropanamide

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A mixture of N-(3-chlorophenyl)-2-(6-bromomethyl-2,3-dihydro-4-oxo-5-phenyl-4H-1,3-oxazin-3-yl)-2-methylpropanamide (compound 8, 0.2 g) and sodium iodide (0.065 g) in acetone was heated under reflux for 18 hours, then evaporated to give a residue which was redissolved in ether. The ethereal solution was washed in turn with saturated aqueous sodium thiosulphate solution and water, dried (magnesium sulphate) and evaporated under reduced pressure to leave a residue which was purified by dry column chromatography on silica, eluting with ethyl acetate/dichloromethane to give N-(3-chlorophenyl)-2-(2,3-dihydro-6-iodomethyl-4-oxo-5-phenyl-4H-2,3-oxazin-3-yl)-2-methylpropanamide (compound 9, 0.04 g) as a white solid, m.p. 134.6-136.6° C.

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