反应详情

using ethyl 2-chloro-5-isocyanatobenzoate and ethyl 3-aminocrotonate there is obtained ethyl 2-chloro-5-{3-[2-(ethoxycarbonyl)-1-methylvinyl]ureido}-benzoate, using isopropyl 2-chloro-4-fluoro-5-isocyanatobenzoate and ethyl 3-aminocrotonate there is obtained isopropyl 2-chloro-4-fluoro-5-{3-[2-(ethoxycarbonyl)-1-methylvinyl]ureido}benzoate, m.p. 147°-150° C.,