Spectrophotometric study on the thermodynamics of binding of α- and β-cyclodextrin towards some p-nitrobenzene derivativesElectronic supplementary information (ESI) available: Values of inclusion constants at different temperatures. See http://www.rsc.org/suppdata/ob/b3/b300330b/
<i>N</i>-(2-Nitrophenyl)proline: An Intramolecular Hydrogen Bond Forming Reagent for the Determination of the Absolute Configuration of Primary Amines
作者:Hee Choon Ahn、Kihang Choi
DOI:10.1021/ol7017455
日期:2007.9.1
N-(2-Nitrophenyl)proline (2-NPP) amides of primaryamines have a conformational preference for intramolecular hydrogen bonding. Because of the strong and selective anisotropic effects on the amine substituents, the absolute configuration of alpha-chiral primaryamines can be assigned by comparing the 1H chemical shifts of diastereomeric 2-NPP amides.
been studied and analyzed using the empirical Kamlet–Taft solvent polarity parameters π* (dipolarity/polarizability), α (hydrogenbond donating ability), and β (hydrogenbond accepting ability). Reasonable Kamlet–Taft solvatochromic correlations (r > 0.95) were established for the three amide derivatives 3–5 in a range of common solvents and three room temperature ionic liquids (RTILs). The UV/Vis absorption
N-Aryl-prolyl-dipeptides as potent antagonists of VLA-4
作者:Theodore M. Kamenecka、Thomas Lanza, Jr.、Stephen E. de Laszlo、Bing Li、Ermengilda D. McCauley、Gail Van Riper、Linda A. Egger、Usha Kidambi、Richard A. Mumford、Sharon Tong、Malcolm MacCoss、John A. Schmidt、William K. Hagmann
DOI:10.1016/s0960-894x(02)00356-6
日期:2002.8
The design, synthesis, and biological evaluation of N-arylprolyl-dipeptide derivatives as small molecule VLA-4 antagonists is described. Potency against VLA-4 and alpha(4)beta(7) and rat pharmacokinetic evaluation revealed some advantages over the related N-(arylsulfonyl)-prolyl-dipeptide analogues. (C) 2002 Elsevier Science Ltd. All rights reserved.
Spectrophotometric study on the thermodynamics of binding of α- and β-cyclodextrin towards some p-nitrobenzene derivativesElectronic supplementary information (ESI) available: Values of inclusion constants at different temperatures. See http://www.rsc.org/suppdata/ob/b3/b300330b/
作者:Paolo Lo Meo、Francesca D'Anna、Serena Riela、Michelangelo Gruttadauria、Renato Noto
DOI:10.1039/b300330b
日期:2003.4.23
Binding properties of native α- and β-cyclodextrin towards some nitrobenzene derivatives have been studied by means of UV-vis spectrophotometry. The former host is able to form complexes having 1 : 1 and 1 : 2 stoichiometric ratios with these guests, while only 1 : 1 complexes are detected with the latter host. A careful analysis of the thermodynamic parameters for complexation equilibria, under the perspective of the enthalpyâentropy compensation effect, reveals that binding abilities of the two different hosts are subject to different features.
Chiral, Solvatochromic Schiff Bases Containing the (<i>S</i>)-Proline or (<i>R</i>)-3-Aminopropane-1,2-diol Functionality
作者:Stefan Spange、Katja Schreiter、Katja Hofmann
DOI:10.1055/s-2006-942408
日期:2006.7
Chiral 4-nitroaniline derivatives 2a,b containing amino acid and 1,2-diol functionalities have been synthesized by specific nucleophilic substitution of 1-fluoro-4-nitrobenzene (1) with (S)-proline or (R)-3-aminopropane-1,2-diol. Following reduction of the nitro groups under very mild conditions, the corresponding p-phenylenediamine derivatives 3a,b were obtained which are very sensitive to oxidation. Thus, 3a,b were converted in situ into chiral, solvatochromic Schiff bases.