M. Kuchar et al., SOME ANALOGS OF ',4'-DIFLUOROBIPHENYL-3-YL)-2-METHYL-4-OXOBUTANOIC ACID - SYNTHESIS AND ANTIINFLAMMATORY ACTIVITY, Collection of Czechoslovak Chemical Communications, 60(6), 1995, pp. 1026-1033
Analogs of 4-(2',4'-difluorobiphenyl-4-yl)-2-methyl 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 ev
aluated and compared with that of flobufen. None of the mentioned anal
ogs reached the activity of the standard. Isomerization of the unsatur
ated derivatives is connected with a shift of the double bond, Z-E tra
nsformation or lactonization. Reaction conditions and spectra of the c
ompounds prepared are described.