Reaction of 4-phenyloxazole with propiolic acid gave 3-furoic acid (37%); reaction of 4-phenyloxazole with ethynyl methyl ketone gave 3-acetylfuran (41%). No Diels–Alder reaction was detected between the acetylenes and 1,3,4-oxadiazole.
S. R. Ohlsen and S. Turner, J. Chem. Soc. C, 1971, 1632 DOI: 10.1039/J39710001632
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