Neither azeotropic drying, nor base nor other additives: a minimalist approach to <sup>18</sup>F-labeling
作者:R. Richarz、P. Krapf、F. Zarrad、E. A. Urusova、B. Neumaier、B. D. Zlatopolskiy
DOI:10.1039/c4ob01336k
日期:——
A novel, efficient, time-saving and reliable radiolabeling procedure via nucleophilic substitution with [18F]fluoride is described. Different radiolabeled aliphatic and aromatic compounds were prepared in high radiochemical yields simply by heating of quaternary anilinium, diaryliodonium and triarylsulfonium [18F]fluorides in suitable solvents. The latter were obtained via direct elution of 18F− from
Preparation of quarternary ammonium salt-tagged ferrocenylphosphine-imine ligands and their application to palladium-catalyzed asymmetric allylic substitution
作者:Hao Yuan、Zhiming Zhou、Jiangliang Xiao、Lixuan Liang、Li Dai
DOI:10.1016/j.tetasy.2010.05.047
日期:2010.8
A series of novel quarternary ammonium salt-modified chiral ferrocenylphosphine-imine ligands have been synthesized and the molecular structure of BIT5 has been determined by single-crystal X-ray diffraction. The applicability of these ligands in asymmetric C*-C and C*-N bond formation was demonstrated. High enantioselectivity was obtained in the Pd-catalyzed asymmetric substitution of 1,3-diphenyl-2-propenyl acetate, with dimethyl malonate (up to 94.6% ee) and benzylamine (up to 92.6% ee). (C) 2010 Published by Elsevier Ltd.
88. Symmetrical triad prototropic systems. Part VIII. The analogy between symmetrical triad systems and aromatic side-chain reactivity, and the effect of m-substitution on mobility and equilibrium in the αγ-diphenylmethyleneazomethine system
作者:Charles William Shoppee
DOI:10.1039/jr9320000696
日期:——
1,4-Dihydropyridine antagonist activities at the calcium channel: a quantitative structure-activity relationship approach
作者:Robert A. Coburn、Mark Wierzba、Mark J. Suto、Alan J. Solo、A. M. Triggle、David J. Triggle
DOI:10.1021/jm00119a009
日期:1988.11
The effect of 46 1,4-dihydropyridine-type calcium channel antagonists on the tonic contractile response of longitudinal muscle strips of guinea pig ileum was determined. 2,6-Dimethyl-3,5-dicarbomethoxy-4-phenyl-1,4-dihydropyridine (13) and 13 ortho-, 15 meta-, and seven para-monosubstituted and 10 polysubstituted aromatic derivatives of 13 were studied. The pharmacological activities of the monosubstituted derivatives were best correlated by eq 10, log 1/C = 0.68 pi + 2.50 sigma m -0.47Lmeta -3.40B1para + 11.31, which had a correlation coefficient of 0.89. The full data set was best correlated by eq 11, log 1/C = 0.62 pi + 1.96 sigma m -0.44Lmeta -3.26B1para -1.51Lmeta' + 14.23, which had a correlation coefficient of 0.90. Equations of similar form but involving an ortho steric term were found to correlate the radioligand binding data for this class of compounds.