6-(5-Methyl-2-phenyl-4-oxazolylmethoxy) benzofuran-2-methanol → 6-(5-Methyl-2-phenyl-4-oxazolylmethoxy)-2-benzofurancarbaldehyde

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A mixture of 6-(5-methyl-2-phenyl-4-oxazolylmethoxy) benzofuran-2-methanol (21.0 g), activated manganese dioxide (52.0 g) and tetrahydrofuran (800 ml) was stirred at 60° to 65° C. for 6 hours. After the insoluble portion was filtered off, the filtrate was concentrated; the residue was subjected to silica gel column chromatography. From the fraction eluted with ethyl acetate-chloroform (2:98, v/v), crystals of 6-(5-methyl-2-phenyl-4-oxazolylmethoxy) benzofuran-2-carbaldehyde (14.3 g, 69%) were obtained, which was then recrystallized from dichloromethane-isopropyl propyl ether to yield colorless prisms having a melting point of 137° to 138° C.

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