Discovery of a Series of 3-Cinnoline Carboxamides as Orally Bioavailable, Highly Potent, and Selective ATM Inhibitors. 2018

Bernard Barlaam, and Elaine Cadogan, and Andrew Campbell, and Nicola Colclough, and Allan Dishington, and Stephen Durant, and Kristin Goldberg, and Lorraine A Hassall, and Gareth D Hughes, and Philip A MacFaul, and Thomas M McGuire, and Martin Pass, and Anil Patel, and Stuart Pearson, and Jens Petersen, and Kurt G Pike, and Graeme Robb, and Natalie Stratton, and Guohong Xin, and Baochang Zhai
Oncology, IMED Biotech Unit, AstraZeneca, Cambridge, U.K.

We report the discovery of a novel series of 3-cinnoline carboxamides as highly potent and selective ataxia telangiectasia mutated (ATM) kinase inhibitors. Optimization of this series focusing on potency and physicochemical properties (especially permeability) led to the identification of compound 21, a highly potent ATM inhibitor (ATM cell IC50 0.0028 μM) with excellent kinase selectivity and favorable physicochemical and pharmacokinetics properties. In vivo, 21 in combination with irinotecan showed tumor regression in the SW620 colorectal tumor xenograft model, superior inhibition to irinotecan alone. Compound 21 was selected for preclinical evaluation alongside AZD0156.

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