3-Hydroxybenzaldehyde → 3-[(4,5-Diphenyl-2-oxazolyl)methoxy]benzaldehyde

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A mixture of 2-bromomethyl-4,5-diphenyloxazole (26.72 g, 85 mmol) obtained according to D. L. Aldous, et al., J. Org. Chem. 2, 228-334 (1937), 3-hydroxybenzaldehyde (9.34 g, 76 mmol), potassium carbonate (12.92 g, 93 mmol), potasssium iodide (0.5 g) and dimethylformamide (250 mL) was stirred at 110° C. After 45 minutes, the mixture was cooled, diluted with water and extracted with diethyl ether (3×). The combined extracts were washed with water (3×), dried over sodium sulfate and concentrated in vacuo to give an oil which was chromatographed on a column of silica gel. Elution with a mixture of hexanes and diethyl ether (2:1) afforded 3-[(4,5-diphenyl-2-oxazolyl)methoxy]benzaldehyde (21.16 g, 70%). An analytical sample was recrystallized from a mixture of CH2Cl2 and hexanes and had mp 72°-75° C.

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