Acetic Acid → 1-Benzyl-5-benzylidene-3-phenylbarbituric acid

참여 물질

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반응 단계

In a 300-ml glass flask equipped with a thermometer, a reflux condenser and a stirrer, 4.0 g of 1-benzyl-3-phenylbarbituric acid, 1.6 g of benzaldehyde, and 40 ml of acetic acid were put, the content was added with a drop of sulfuric acid, kept under stirring, the flask was heated so as to adjust the inner temperature to 100° C., and the content was continued to be stirred at 100° C. for 3 hours. The content was then cooled to 50° C., added with a mixed solution of 39 ml of isopropanol and 17 ml of water, stirred at 10° C. or below for one hour, filtered under suction to collect a deposited crystal, and the crystal was washed with methanol, to thereby obtain 3.9 g of 1-benzyl-5-benzylidene-3-phenylbarbituric acid as an intermediate.

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