Analogs of 4-(2',4'-difluorobiphenyl-4-yl)-2-methyl-4-oxobutanoic acid (I, flobufen), containing a double bond (II, IV, V, VII, VIII) or a methyl group in position 3 (VI) were prepared. Their antiinflammatory activity was evaluated and compared with that of flobufen. None of the mentioned analogs reached the activity of the standard. Isomerization of the unsaturated derivatives is connected with a shift of the double bond, Z-E transformation or lactonization. Reaction conditions and spectra of the compounds prepared are described.
4-(2',4'-二氟联苯基-4-基)-2-甲基-4-氧代丁酸(I,氟布芬)的类似物,包含双键(II、IV、V、VII、VIII)或在位置3有一个甲基基团(VI)被制备。评估了它们的抗炎活性,并与氟布芬进行了比较。所述的类似物中没有一个达到标准的活性。不饱和衍生物的异构化与双键的转移、Z-E转化或内酯化有关。描述了制备的化合物的反应条件和光谱。