反应详情

3.9 g (17.95 mmol) of ethyl 4-phenyl-3-isoxazolecarboxylate and 5.8 g (36.2 mmol) of t-butyl (2-aminoethyl)carbamate were heated together to 110° for 2 hours under reduced pressure. Chromatography on silica gel and elution with methylene chloride which contained 5% and, respectively, 10% of ethyl acetate yielded an oil which crystallized from ethyl acetate/hexane. In this manner there were obtained 5.0 g (84%) of t-butyl [2-(4-phenyl-3-isoxazolecarboxamido)ethyl]carbamate as white crystals. melting point 170°-171°.

1. washChromatography on silica gel and elution with methylene chloride which
2. customrespectively, 10% of ethyl acetate yielded an oil which
3. customcrystallized from ethyl acetate/hexane