反应详情

Analogously to the procedure described in Example 1, starting from ethyl 3-amino-4,4,4-trifluorocrotonate and 3,4-dihydro-6-isocyanato-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazine there is obtained 6-{3-[2-(ethoxycarbonyl)-1-trifluoromethyl-vinyl]ureido}-3,4-dihydro-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazine (not isolated) and, after cyclization of this benzoxazine, there is obtained 3-[3,4-dihydro-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazin-6-yl]-6-trifluoromethyl-2,4-(1H,3H)-pyrimidinedione, m.p. >250° C.