反应详情

using isopropyl 2-chloro-4-fluoro-5-ureidobenzoate and ethyl 3-oxo-n-valerate and finely powdered Amberlyst®-15 (an organic polymeric resin featuring free sulphone groups) as catalyst there is obtained isopropyl 2-chloro-4-fluoro-5-{3-[2-(ethoxycarbonyl)-1-ethylvinyl]ureido}-benzoate, m.p. 123°-126° C.,