N-(1-ethyl-1-methylpropyl)-N'-3-pyridylcarbodiimide 、 N-((tert-butylimino)methylene)pyridin-3-amine 以the N"-cyano-N-(1-ethyl-1-methylpropyl)-N'-3-pyridylguanidine was obtained with a melting point of 184.5°-186.0° C.的产率得到N"-cyano-N-(1-ethyl-1-methylpropyl)-N'-3-pyridylguanidine
Palladium-catalyzed cross-coupling reaction of azides with isocyanides
作者:Zhen Zhang、Zongyang Li、Bin Fu、Zhenhua Zhang
DOI:10.1039/c5cc05981j
日期:——
A palladium-catalyzed cross-coupling reaction of azides with isocyanides is developed, providing a general synthetic route to unsymmetric carbodiimides.
The invention relates to a series of new compounds, to methods for preparing the compounds, to compositions containing said compounds which are useful in the human and veterinary medical practice, and to methods for treating patients suffering from certain illnesses with said compounds, the new compounds having the general formula I ##STR1## or the tautomeric forms thereof in which the R.sup.1 -substituted cyano-guanidyl radical is placed in the 2-, 3- or 4-position of the pyridine ring, and in which R.sup.1 stands for a straight or branched, saturated or unsaturated, aliphatic hydrocarbon radical having from 1 to 8 carbon atoms, a cycloalkyl or cycloalkenyl radical having from 3 to 7 carbon atoms, an aryl or an aralkyl radical, and R.sup.2 stands for hydrogen, halogen, hydroxy, lower alkyl or alkoxy radicals; and in the case of the present compounds containing one or more asymmetric carbon atoms, also the stereoisomers thereof and racemic mixtures of same; and salts of the compounds of formula I with nontoxic, pharmaceutically acceptable acids. The new compounds of the invention have surprisingly shown to be highly potent hypotensive compounds giving rise to a pronounced reduction of the blood pressure. They have a low toxicity and consequently a high therapeutic ratio.
Structure-activity studies of potassium channel opening in pinacidil-type cyanoguanidines, nitroethenediamines, thioureas, and ureas
作者:Paul W. Manley、Ulrich Quast
DOI:10.1021/jm00090a025
日期:1992.6
attributable to an increased opening of potassium channels. The resulting quantitative in vitro data has been used to analyze the structure-activity relationships for potassium channel opening, allowing the biological activity to be rationalized in terms of a pharmacophore involving a hydrogen-bond-acceptor element, a hydrogen-bond-donor element, and a lipophilic binding group. A model for the binding of pinacidil-related
A new and distinct cultivar of
Nelumbo
plant named ‘Zhijiang Qiuyue’, characterized by its upright plant habit; moderately vigorous growth habit; large medium green-colored leaves; freely flowering habit; and large pale yellow and green white-colored plated globose-shaped flowers that are positioned above the foliar plane on moderately strong and erect peduncles.