反应详情

As described for example 112a, 5-methyl-isoxazole-3-carboxylic acid methyl ester in butanol was reacted with hydrazine hydrate (2 equivalents) at 100° C. for 2 h. Evaporation of all volatiles and chromatography (SiO2, dichloromethane:methanol:aq.ammonia (25%)=100:0:0 to 90:10:1) afforded the title compound as a white solid (yield: 64%). 1H-NMR (300 MHz, DMSO): δ=2.44 (d, J=1 Hz, 3H), 4.57 (s, 2H), 6.52 (d, J=1 Hz, 1H), 9.94 (s, 1H).

1. customEvaporation of all volatiles and chromatography (SiO2, dichloromethane:methanol:aq.ammonia (25%)=100:0:0 to 90:10:1)