Triarylmethanols are effectively dehydroarylated and reacted with some unsaturated compounds by using an appropriate palladium catalyst system such as Pd(OAc)(2)-P(1-Nap)(3) (1-Nap = 1-naphthyl) to give the corresponding arenes and hydroarylation products, respectively, along with diaryl ketones.
Triarylmethanes and 9-arylxanthenes as prototypes amphihydric compounds for relating the stabilities of cations, anions and radicals by C-H bond cleavage and electron transfer
作者:Edward M. Arnett、Robert A. Flowers、Richard T. Ludwig、Alison E. Meekhof、Stuart A. Walek
Thermodynamic stability properties of II p-substituted trityl and seven 9-phenylxanthyl carbocations are reported in sulfolane and of their conjugate carbanions in DMSO. The cations are compared by calorimetric heats of hydride transfer from cyanoborohydride ion, their first and second reduction potentials, their PK(R)(+)s in aqueous sulfuric acid, C-13 chemical shifts and free energies of methoxy exchange. Carbanlons are compared by their heats and free energies (pK(HA)) of deprotonation and their first and second oxidation potentials. Radicals are compared by their oxidation and reduction potentials. Their bond dissociation energies are derived by alternative routes: from the carbocation and its reduction potential and from the carbanion and its oxidation potential. The various properties are correlated against each other and against appropriate Hammett-type substituent parameters. Correlations between the different measured properties reported here range from fair to excellent, Despite their importance as historic prototypes for the three trivalent oxidation states of carbon, trityl and xanthyl systems are atypical models for comparing transmission of electron demand In other series of carbocations, radicals or carbanions with significantly different structures. The 9-arylxanthyl series is especially poor because of its insensitivity to substituent effects. The effects of substituents on various properties which represent the stabilities of R(+)s correlate surprisingly well against those for corresponding R(-)s. Accordingly, compensating effects on the oxidation and reduction of a series of related RS may lead to a nearly constant electron transfer energy and absolute hardness for the series. In contrast, the free energies for interconversion of the carbocations and carbanions which determine the gap between pK(R+) and pK(HA) are very sensitive to structural change. (C) 1997 by John Wiley & Sons, Ltd.
KOORTS J.;TALJAARD B.;GOOSEN A., S. AFR. J. CHEM., 1987, 40, N 4, 237-242
作者:KOORTS J.、TALJAARD B.、GOOSEN A.
DOI:——
日期:——
TALJAARD B.; GOOSEN A.; MCCLELAND C. W., S. AFR. J. CHEM., 40,(1987) N 2, 139-145
作者:TALJAARD B.、 GOOSEN A.、 MCCLELAND C. W.
DOI:——
日期:——
Structure-Guided Design of Novel <scp>l</scp>-Cysteine Derivatives as Potent KSP Inhibitors
previously reported S-trityl-l-cysteine derivatives as selective KSP inhibitors. Here, we report further optimizations using docking modeling in the L5 allosteric binding site, which led to the discovery of several high affinity derivatives with two fused phenyl rings in the trityl group giving low nanomolar range KSP ATPase inhibition. The representative derivatives potently inhibited cell growth of HCT116