The development of novel C-2, C-8, and N-9 trisubstituted purines as inhibitors of TNF-α production

A series of C-2, C-8, and N-9 trisubstituted purine based inhibitors of TNF-α production are described. The most potent analogs showed low nanomolar activity against LPS-induced TNF-α production in a THP-1 cell based assay. The SAR of the series was optimized with the aid of X-ray co-crystal structures of these inhibitors bound with mutated p38 (mp38).