The relative benzylic deprotonation rate constants of aryl–benzyl sulfides have been measured and the obtained values were compared with the substituent constants using the Hammett equation and with deprotonation Gibbs energies calculated on B3LYP/aug-cc-pVDZ level. The deprotonation rate depends on the stabilization of the negative charge, which is spread over the benzene ring. The series of brominated
respectively. On the basis of X‐ray and solution NMR data from the literature, it is shown that solvent‐separated ionpairs (SIP) can be distinguished from contactionpairs (CIP) by the different magnitudes of χ(7Li) and typical shifts for δ(6,7Li) and δ(13C). Systems with 2 mol equiv. crown ether ligand [12]crown‐4 exist exclusively as SIP structures and show χ(7Li) values < 50 kHz, whereas for CIP structures
Synthesis of benzhydryl ethers by a carbon-carbon bond-forming reaction using benzhydryl 2-chloroethyl ether. A method for attaching a protected 2-hydroxyethyl group to a benzylic carbon
作者:Constantinos G. Screttas、Maria Micha-Screttas
DOI:10.1021/jo00136a042
日期:1982.7
Mataka, Shuntaro; Takahashi, Kazufumi; Yamamoto, Hajime, Journal of the Chemical Society. Perkin transactions I, 1980, p. 2417 - 2421
Inhibitors of hepatitis C virus NS3·4A protease. Part 3: P2 proline variants
作者:Robert B Perni、Luc J Farmer、Kevin M Cottrell、John J Court、Lawrence F Courtney、David D Deininger、Cynthia A Gates、Scott L Harbeson、Joseph L Kim、Chao Lin、Kai Lin、Yu-Ping Luong、John P Maxwell、Mark A Murcko、Janos Pitlik、B.Govinda Rao、Wayne C Schairer、Roger D Tung、John H Van Drie、Keith Wilson、John A Thomson
DOI:10.1016/j.bmcl.2004.01.078
日期:2004.4
We recently described the identification of an optimized alpha-ketoamide warhead for our series of HCV NS3(.)4A inhibitors. We report herein a series of HCV protease inhibitors incorporating 3-alkyl-substituted prolines in P-2. These compounds show exceptional enzymatic and cellular potency given their relatively small size. The marked enhancement of activity of these 3-substituted proline derivatives relative to previously reported 4-hydroxyproline derivatives constitutes additional evidence for the importance of the S-2 binding pocket as the defining pharmacophore for inhibition of the NS3(.)4A enzyme. (C) 2004 Elsevier Ltd. All rights reserved.