Novel heterocyclic ring-substituted pyrimidines have been designed as inhibitors of glycogen synthase kinase-3β (GSK-3β) from the modification of known inhibitors. Several potent inhibitors exhibiting nanomolar activities were discovered against GSK-3β kinase as well as in an NF-κB reporter gene assay. Based on the results from in vitro TNF-α release inhibition and in vivo endotoxima, these inhibitors are expected to be useful candidates for ...