Homophthalic anhydride → (E)-2-[2-[3-[2-[4-(cyclopropyl)-2-thiazolyl]ethenyl]phenylamino]-2-oxoethyl]benzoic acid

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A solution of 5.0 g of (E)-3-[2-[4-(cyclopropyl)-2-thiazolyl]ethenyl]benzeneamine, 3.35 g of homophthalic anhydride, and 100 ml of toluene was heated to reflux for 0.5 hr. After cooling, the solids that formed were collected by filtration and this material was triturated with ethyl ether to yield 7.4 g of (E)-2-[2-[3-[2-[4-(cyclopropyl)-2-thiazolyl]ethenyl]phenylamino]-2-oxoethyl]benzoic acid. Recrystallization from acetonitrile yielded 5.1 g of material; m.p. 200°-201° C. Anal. Calcd for C23H20N2O3S: C, 68.30; H, 4.98; N, 6.93. Found: C, 67.92; H, 4.97; N, 6.83.

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