Nickel-Catalyzed Direct Arylation of C(sp<sup>3</sup>)–H Bonds in Aliphatic Amides via Bidentate-Chelation Assistance
作者:Yoshinori Aihara、Naoto Chatani
DOI:10.1021/ja411715v
日期:2014.1.22
The Ni-catalyzed, direct arylation of C(sp(3))-H (methyl and methylene) bonds in aliphatic amides containing an 8-aminoquinoline moiety as a bidentate directing group with aryl halides is described. Deuterium-labeling experiments indicate that the C-H bond cleavage step is fast and reversible. Various nickelcomplexes including both Ni(II) and Ni(0) show a high catalytic activity. The results of a
The introduction of P4 substituted 1-methylcyclohexyl groups into Boceprevir®: A change in direction in the search for a second generation HCV NS3 protease inhibitor
作者:Frank Bennett、Yuhua Huang、Siska Hendrata、Raymond Lovey、Stephane L. Bogen、Weidong Pan、Zhuyan Guo、Andrew Prongay、Kevin X. Chen、Ashok Arasappan、Srikanth Venkatraman、Francisco Velazquez、Latha Nair、Mousumi Sannigrahi、Xiao Tong、John Pichardo、Kuo-Chi Cheng、Viyyoor M. Girijavallabhan、Anil K. Saksena、F. George Njoroge
DOI:10.1016/j.bmcl.2010.02.063
日期:2010.4
In the search for a second generation HCV protease inhibitor, molecular modeling studies of the X-ray crystal structure of Boceprevir (R) 1 bound to the NS3 protein suggest that expansion into the S4 pocket could provide additional hydrophobic Van der Waals interactions. Effective replacement of the P4 tertbutyl with a cyclohexylmethyl ligand led to inhibitor 2 with improved enzyme and replicon activities. Subsequent modeling and SAR studies led to the pyridine 38 and sulfone analogues 52 and 53 with vastly improved PK parameters in monkeys, forming a new foundation for further exploration. (C) 2010 Elsevier Ltd. All rights reserved.