5-Benzothiazole substituted pyrimidine derivatives as HCV replication (replicase) inhibitors
作者:Ashok Arasappan、Frank Bennett、Vinay Girijavallabhan、Yuhua Huang、Regina Huelgas、Carmen Alvarez、Lei Chen、Stephen Gavalas、Seong-Heon Kim、Aneta Kosinski、Patrick Pinto、Razia Rizvi、Randall Rossman、Bandarpalle Shankar、Ling Tong、Francisco Velazquez、Srikanth Venkatraman、Vishal A. Verma、Joseph Kozlowski、Neng-Yang Shih、John J. Piwinski、Malcolm MacCoss、Cecil D. Kwong、Jeremy L. Clark、Anita T. Fowler、Feng Geng、Hollis S. Kezar、Abhijit Roychowdhury、Robert C. Reynolds、Joseph A. Maddry、Subramaniam Ananthan、John A. Secrist、Cheng Li、Robert Chase、Stephanie Curry、Hsueh-Cheng Huang、Xiao Tong、F. George Njoroge
DOI:10.1016/j.bmcl.2012.03.036
日期:2012.5
Based on a previously identified HCV replication (replicase) inhibitor 1, SAR efforts were conducted around the pyrimidine core to improve the potency and pharmacokinetic profile of the inhibitors. A benzothiazole moiety was found to be the optimal substituent at the pyrimidine 5-position. Due to potential reactivity concern, the 4-chloro residue was replaced by a methyl group with some loss in potency and enhanced rat in vivo profile. Extensive investigations at the C-2 position resulted in identification of compound 16 that demonstrated very good replicon potency, selectivity and rodent plasma/target organ concentration. Inhibitor 16 also demonstrated good plasma levels and oral bioavailability in dogs, while monkey exposure was rather low. Chemistry optimization towards a practical route to install the benzothiazole moiety resulted in an efficient direct C-H arylation protocol. (C) 2012 Elsevier Ltd. All rights reserved.
A Modular Approach toward Regulating the Secondary Coordination Sphere of Metal Ions: Differential Dioxygen Activation Assisted by Intramolecular Hydrogen Bonds
作者:Robie L. Lucas、Matthew K. Zart、Jhumpa Murkerjee、Thomas N. Sorrell、Douglas R. Powell、A. S. Borovik
DOI:10.1021/ja063935+
日期:2006.12.1
[Cp2Fe]+/[Cp2Fe]. The properties of [CoIIH3buea]- (H3buea, tris[(N'-tert-butylureaylato)-N-ethyl]aminato that has three H-bond donors) appears to be similar to that of the other complexes based on spectroscopic data. [CoIIH3buea]- and [CoIIH(2)2iPr]- react with 0.5 equiv of dioxygen to afford [CoIIIH3buea(OH)]- and [CoIIIH(2)2iPr(OH)]-. Isotopic labeling studies confirm that dioxygen is the source of the