Identification of the minimum PAR4 inhibitor pharmacophore and optimization of a series of 2-methoxy-6-arylimidazo[2,1- b ][1,3,4]thiadiazoles
摘要:
This letter describes the further deconstruction of the known PAR4 inhibitor chemotypes (MWs 490-525 and with high plasma protein binding) to identify a minimum PAR4 pharmacophore devoid of metabolic liabilities and improved properties. This exercise identified a greatly simplified 2-methoxy-6-arylimidazo [2,1-b][1,3,4]thiadiazole scaffold that afforded nanomolar inhibition of both activating peptide and gamma-thrombin mediated PAR4 stimulation, while reducing both molecular weight and the number of hydrogen bond donors/acceptors by similar to 50%. This minimum PAR4 pharmacophore, with competitive inhibition, versus non-competitive of the larger chemotypes, allows an ideal starting point to incorporate desired functional groups to engender optimal DMPK properties towards a preclinical candidate. (C) 2016 Elsevier Ltd. All rights reserved.
Highly substituted imidazo[2,1-b][1,3,4]thiadiazole derivatives were synthesized through successive cyclization and Suzuki–Miyauracross-couplingreactions. The palladium-catalyzed coupling reaction was optimized and a wide range of boronic acids was used to evaluate the scope and limitations of the methodology. The final compounds were obtained in fair to very good yields and high compatibility with
Identification of the minimum PAR4 inhibitor pharmacophore and optimization of a series of 2-methoxy-6-arylimidazo[2,1- b ][1,3,4]thiadiazoles
作者:Kayla J. Temple、Matthew T. Duvernay、Jae G. Maeng、Anna L. Blobaum、Shaun R. Stauffer、Heidi E. Hamm、Craig W. Lindsley
DOI:10.1016/j.bmcl.2016.10.020
日期:2016.11
This letter describes the further deconstruction of the known PAR4 inhibitor chemotypes (MWs 490-525 and with high plasma protein binding) to identify a minimum PAR4 pharmacophore devoid of metabolic liabilities and improved properties. This exercise identified a greatly simplified 2-methoxy-6-arylimidazo [2,1-b][1,3,4]thiadiazole scaffold that afforded nanomolar inhibition of both activating peptide and gamma-thrombin mediated PAR4 stimulation, while reducing both molecular weight and the number of hydrogen bond donors/acceptors by similar to 50%. This minimum PAR4 pharmacophore, with competitive inhibition, versus non-competitive of the larger chemotypes, allows an ideal starting point to incorporate desired functional groups to engender optimal DMPK properties towards a preclinical candidate. (C) 2016 Elsevier Ltd. All rights reserved.