反应详情

A solution of ethyl 5-tert-butyl-[1,3,4]oxadiazole-2-carboxylate (1.38 g, 7 mmol) and (S)-1-phenylethylamine (1.70 g, 14 mmol) in absolute ethanol (25 ml) is refluxed for 6 hours. The solvent is evaporated in vacuo and the residue is purified by flash column chromatography (silica gel, hexane/ethyl acetate 4:1 v/v) to give (S)-5-tert-butyl-[1,3,4]oxadiazole-2-carboxylic acid (1-phenylethyl)amide (1.76 g, 92%) as colourless crystals, m.p. 123°-125° C.

1. customThe solvent is evaporated in vacuo
2. customthe residue is purified by flash column chromatography (silica gel, hexane/ethyl acetate 4:1 v/v)