Design, synthesis and anti-rheumatoid arthritis evaluation of double-ring conjugated enones

Four series of double-ring conjugated enones were designed, synthesized and studied for the inhibition of synovial cell activity through the modification of Dysodensiol K core structure, double-ring, double-bond and double-carbonyl groups. For in vitro synovial cell assay of rats, compound 151 and 168 exhibited good inhibitory activities, with IC 50 values of 2.71 ± 0.18 and 2.68 ± 0.16 μM respectively. At the same time, the LDH release and LD 50 test results revealed that the target compounds were low cytotoxicity and acute toxicity. For in vivo CIA model test through the oral administration, compounds 151 and 168 were exhibited similar effect to positive control group methotrexate.