A novel series of IKKβ inhibitors part I: Initial SAR studies of a HTS hit
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Updated: Jun 6, 2026

Kinase Inhibitor Screening In Self-assembled Human Protein Microarrays
Published on: October 23, 2019
Timothy D Cushing1, Vijay Baichwal, Karen Berry
1Medicinal Chemistry, Amgen Inc, 1120 Veterans Blvd, South San Francisco, CA 94080, USA. tcushing@amgen.com
Abstract:
A novel series of (E)-1-((2-(1-methyl-1H-imidazol-5-yl) quinolin-4-yl) methylene) thiosemicarbazides was discovered as potent inhibitors of IKKβ. In this Letter we document our early efforts at optimization of the quinoline core, the imidazole and the semithiocarbazone moiety. Most potency gains came from substitution around the 6- and 7-positions of the quinoline ring. Replacement of the semithiocarbazone with a semicarbazone decreased potency but led to some measurable exposure.
