Ring-fused pyrazole derivatives as potent inhibitors of lymphocyte-specific kinase (Lck): Structure, synthesis, and SAR

We have identified a novel series of ring-fused pyrazole derivatives as lymphocyte-specific kinase (Lck) inhibitors. The most potent analogs exhibited good enzyme inhibitory activity (IC(50)s <1 nM) as well as excellent cellular activity against mixed lymphocyte reaction (MLR) (IC(50)s <1 nM). (C) 2009 Elsevier Ltd. All rights reserved.