52107-21-8Relevant articles and documents
Synthesis and Optimization of Kv7 (KCNQ) Potassium Channel Agonists: The Role of Fluorines in Potency and Selectivity
Liu, Ruiting,Tzounopoulos, Thanos,Wipf, Peter
supporting information, p. 929 - 935 (2019/06/13)
Based on the potent Kv7 agonist RL-81, we prepared new lead structures with greatly improved selectivity for Kv7.2/Kv7.3 over related potassium channels, i.e., Kv7.3/Kv7.5, Kv7.4, and Kv7.4/7.5. RL-36 and RL-12 maintain an agonist EC2x of ca. 1 μM on Kv7.2/Kv7.3 in a high-throughput assay on an automated electrophysiology platform in HEK293 cells but lack activity on Kv7.3/Kv7.5, Kv7.4, and Kv7.4/7.5, resulting in a selectivity index SI > 10. RL-56 is remarkably potent, EC2x 0.11 ± 0.02 μM, and still shows an SI = 2.5. We also identified analogues with significant selectivity for Kv7.4/Kv7.5 over Kv7.2/Kv7.3. The extensive use of fluorine in iterative core structure modifications highlights the versatility of these substituents, including F, CF3, and SF5, to span orders of magnitude of potency and selectivity in medicinal chemistry lead optimizations.
CYSTEINE PROTEASE INHIBITORS
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Page/Page column 29, (2013/02/28)
Compounds of the formula (I) wherein One of A1 and A2 is N-CH3 and the other is CH; R1 is C1-C6alkyl, C1-C6haloalkyl, C3-C6cycloalkyl or oxetan-3-yl, wherein C3-C6cycloalkyl is optionally substituted with one, two or three fluoro or with CF3; R2a and R2b are independently selected from H, halo, C1-C4alkyl, C1-C4haloalkyl and C1- C4alkoxy; R3 is CH3 or F; n is 1, 2, 3 or 4; or a pharmaceutically acceptable salt, hydrate or N-oxide thereof for the use in the prophylaxis and/or treatment of a disorder characterised by inappropriate expression or activation of cathepsin S.
