Optimization of 3-Pyrimidin-4-yl-oxazolidin-2-ones as Allosteric and Mutant Specific Inhibitors of IDH1. Homo sapiens

High throughput screening and subsequent hit validation identified 4-isopropyl-3-(2-((1-phenylethyl) amino)pyrimidin-4-yl)oxazolidin-2-one as a potent inhibitor of IDH1R132H. Synthesis of the 4 separate diastereomers identified the (S,S)-diastereomer (IDH125) as the most potent isomer. This also showed reasonable cellular activity and excellent selectivity vs IDH1wt. Initial SAR exploration identified the key tolerances and potential for optimization. X-ray crystallography identified a functionally relevant allosteric binding site amenable to inhibitors which can penetrate the blood-brain barrier, and aided rational optimization. Potency improvement and modulation of the physico-chemical properties identified (S)-3-(2-(((S)-1-(5-(4-fluoro-3-methylphenyl)pyrimidin-2-yl)ethyl)amino)pyrimidin-4-yl)-4-isopropyloxazolidin-2-one (IDH889) with good in-vivo exposure and in-vivo activity in a mutant IDH1 xenograft mouse model. identified the (S,S)-diastereomer (IDH125) as the most potent isomer. This also showed reasonable cellular activity and excellent selectivity vs IDH1wt. Initial SAR exploration identified the key tolerances and potential for optimization. X-ray crystallography identified a functionally relevant allosteric binding site amenable to inhibitors which can penetrate the blood-brain barrier, and aided rational optimization. Potency improvement and modulation of the physico-chemical properties identified (S)-3-(2-(((S)-1-(5-(4-fluoro-3-methylphenyl)pyrimidin-2-yl)ethyl)amino)pyrimidin-4-yl)-4-isopropyloxazolidin-2-one (IDH889) with good in-vivo exposure and in-vivo activity in a mutant IDH1 xenograft mouse model Overall design: 30 samples from cell culture with one or two replicates. Possible controls are treated with DMSO, other comparsions can be made between WT and mutant cell lines.