(E)-3-[6-(5-methyl-2-phenyl-4-oxazolylmethoxy)-2-benzofuranyl]propen-1-ol → (E)-3-[6-(5-methyl-2-phenyl-4-oxazolylmethoxy)-2-benzofuranyl]acrolein

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A mixture of (E)-3-[6-(5-methyl-2-phenyl-4-oxazolylmethoxy)-2-benzofuranyl]propen-1-ol (3.85 g), activated manganese dioxide (8.00 g) and dichloromethane (150 ml ) was stirred at room temperature for 2 hours. After the insoluble portion was filtered off, the filtrate was concentrated to yield crystals of (E)-3-[6-(5-methyl-2-phenyl-4-oxazolylmethoxy)-2-benzofuranyl]acrolein (3.40 g, 89%), which was then recrystallized from dichloromethane-isopropyl ether to yield colorless prisms having a melting point of 132° to 133° C.

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