Hydrochloric Acid → Ethyl 2-chloro-5-{3-[2-(ethoxycarbonyl)vinyl]ureido}-benzoate

関与物質

反応手順

6.0 g of ethyl 2-chloro-5-ureidobenzoate and 6.4 g of ethyl 3-ethoxyacrylate are heated at reflux temperature in 100 ml of 1,2-dimethoxyethane and subsequently heated at this temperature with 12 ml of 2N hydrochloric acid for 5 minutes. The reaction mixture is evaporated to dryness under reduced pressure and the residue is purified by chromatography on 300 g of silica gel using ethyl acetate/n-hexane (1:3) as the eluent. There is obtained ethyl 2-chloro-5-{3-[2-(ethoxycarbonyl)vinyl]ureido}-benzoate, m.p. 116°-117° C.

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