Propionic Acid → HCID 59427835、化合物

関与物質

反応手順

A mixture of propionic acid (0.8 ml, 10 mol), diphenylphosphoryl azide (2.22 ml, 10.3 mmol) and triethylamine (1.39 ml, 10 mmol) in toluene (15 ml) was refluxed for 90 minutes. The mixture was then cooled to below 40° C., and a solution of ethyl 2-amino-5-(ethoxycarbonyl)-4-methylthiophene-3-carboxylate (1.76 g, 6.85 mmol) in toluene (10 ml) was added, the mixture refluxed for 24 hours. The reaction mixture was diluted with brine, and extracted with ethyl acetate. The organic layer was washed with brine and dried over sodium sulfate. Solvent was removed under reduced pressure, and the residue purified by column chromatography, eluting with ethyl acetate/hexane 1:6 to 1:4, to provide ethyl 5-(ethoxycarbonyl)-2-[(ethylamino)carbonylamino]-4-methylthiophene-3-carboxylate. The structure was confirmed by 1H NMR and mass spectrometry.

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