2-Amino-3-benzyloxypyridine → 8-Benzyloxy-3-allyl-2-methylimidazo[1,2-a]pyridine

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A solution of 2-amino-3-benzyloxypyridine (3 g) and 3-chloro-5-hexen-2-one (2.981 g) in ethanol (15 ml) was stirred and refluxed for 45 hours and then evaporated in vacuo. To the residue was added an aqueous solution of sodium bicarbonate and the mixture was extracted with ethyl acetate. The extract was washed with water, dried over magnesium sulfate and evaporated in vacuo. The oily residue was purified by column chromatography on silica gel (50 g) using methylene chloride and then chloroform as eluents. The eluate with chloroform was evaporated in vacuo and the residual solid was recrystallized from diisopropyl ether to give 8-benzyloxy-3-allyl-2-methylimidazo[1,2-a]pyridine (0.31 g).

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