5-Amino-2-hydroxy-2,4,6-cycloheptatrien-1-one → 2-(4-Hydroxy-5-oxo-1,3,6-cycloheptatrien-1-ylamino)-2-butenedioic Acid Diethyl Ester

참여 물질

반응 단계

A solution of diethyl acetylenedicarboxylate (183.5 g) and 5-amino-2-hydroxy-2,4,6-cycloheptatriene-1-one [147.5 g, described by T. Nozoe et al., Science Repts. Tokoku Univ., First ser., 35, 274(1952)] in ethanol (2,700 ml) is stirred at room temperature for 16 hours. The mixture is filtered and the precipitate is crystallized from ethanol to obtain crystals of the title compound, mp 108.5° C.

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