CuI-Promoted One-Pot Synthesis of N-Boc Protected β-Ketotriazole Amino Acids: Application in the Synthesis of New Class of Dipeptidomimetics
作者:T. M. Vishwanatha、N. Narendra、Vommina V. Sureshbabu
DOI:10.2174/092986612799363172
日期:2012.3.1
One-pot click chemistry of Nα-Boc-bromomethylketones, NaN3 and propiolic acid affords N-Boc protected 1,4- disubstituted 1,2,3-β-ketotriazole acids in good to excellent yield. The use of CuI as catalyst and DMSO as solvent leads the click reaction to efficient, practical and column-free preparation of the title compounds. The utility of the resulting unnatural amino acids as building blocks to prepare triazole possessing peptidomimetics is also delineated.
Podand- and crown-types of newchiral receptors, characterized by a chiral polyether skeleton and an amide junction, were derivedfromnaturallyoccurringmonensinionophore. Their chiral recognition ability was investigated by ion-selective electrode and 1H-NMR spectroscopic methods. Several podand-type monensin amides formed 1:1 complexes with chiral amine salts and exhibited excellent enantiomer
Design and Synthesis of Depeptidized Macrocyclic Inhibitors of Hepatitis C NS3-4A Protease Using Structure-Based Drug Design
作者:Srikanth Venkatraman、F. George Njoroge、Viyyoor M. Girijavallabhan、Vincent S. Madison、Nanua H. Yao、Andrew J. Prongay、Nancy Butkiewicz、John Pichardo
DOI:10.1021/jm0489556
日期:2005.8.1
polyprotein to form functional and structural proteins of HCV. The enzyme has a shallow binding pocket at the catalytic site, making development of inhibitors difficult. We have designed, preorganized, and depeptidized macrocyclic inhibitors from P(4) to P(2)' and optimized binding to 0.1 microM. The structure of an inhibitor bound to the enzyme was also solved.
Chemically modified monensins bearing neutral terminal groups led to effective enantiomer-selective complex formation with several amine salts in a liquid membrane-type electrode system.
Phosphoramidate Derivatives of Guanosine Nucleoside Compunds for Treatment of Viral Infections
申请人:Chamberlain Stanley
公开号:US20120052046A1
公开(公告)日:2012-03-01
Phosphoramidate compounds derived from guanine bases having enhanced therapeutic potency are provided, and these compounds in particular have enhanced potency with respect to treatment of viral infections, such as hepatitis C virus. Pharmaceutical compositions, methods of preparing the compounds, and methods of using the compounds and compositions to treat viral infections are also provided.