Hit-to-lead evaluation of a novel class of sphingosine 1-phosphate lyase inhibitors

Abstract Inhibition of sphingosine-1-phosphate lyase has recently been proposed as a potential treatment option for inflammatory disorders such as multiple sclerosis, rheumatoid arthritis, and inflammatory bowel disease. In this report we describe our hit-to-lead evaluation of the isoxazolecarboxamide 6 , a high-throughput screening hit (in vitro IC 50  = 1.0 μM, cell IC 50  = 1.8 μM), as a novel S1P lyase inhibitor. We were able to establish basic structure–activity relationships around 6 and succeeded in obtaining X-ray structural information which enabled structure-based design. With the discovery of 28 , enzyme activity was quickly improved to IC 50  = 120 nM and cell potency to IC 50  = 230 nM. The main liability in the established isoxazolecarboxamide hit series was determined to be metabolic stability. In particular we identified that future lead-optimization efforts to overcome this problem should focus on blocking the N -dealkylation on the secondary amine.