反应详情

using isopropyl 2-chloro-4-fluoro-5-{3-[4-(methoxycarbonyl)-2,5-dihydrothien-3-yl]ureido}-benzoate with sodium isopropylate in an isopropanol/dimethylformamide mixture there is obtained isopropyl 2-chloro-4-fluoro-5-{1,2,5,7-tetrahydro-2,4-dioxothieno[3,4-d]pyrimidin-3(4H)-yl}-benzoate, m.p. 180°-183° C.,