反应详情

using ethyl 2-chloro-5-{3-[4-(methoxycarbonyl)-2,5-dihydro-thien-3-yl]ureido}-benzoate with sodium ethylate in ethanol there is obtained ethyl 2-chloro-5-{1,2,5,7-tetrahydro-2,4-dioxo-thieno[3,4-d]pyrimidin-3(4H)-yl}-benzoate, m.p. 194°-196° C.,