乙基3-氨基-4,4,4-三氟-2-丁烯酸酯 、
3,4-dihydro-6-isocyanato-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazine 以there is obtained 6-{3-[2-(ethoxycarbonyl)-1-trifluoromethyl-vinyl]ureido}-3,4-dihydro-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazine (not的产率得到6-{3-[2-(ethoxycarbonyl)-1-trifluoromethyl-vinyl]ureido}-3,4-dihydro-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazine