Chiroptical properties of 1,2-cyclopropanedicarboxylic anhydrides and imides. The cyclopropane ring contribution to the Cotton effect
摘要:
Several optically active 1,2-cyclopropanedicarboxylic anhydrides and imides were prepared and their chiroptical spectra studied. Despite the strained bicyclic skeleton of these compounds, their CD spectra show an unusual solvent dependence. This phenomenon can be explained in terms of the cyclopropane ring contribution to the Cotton effect. A deviation of the skeleton and the anhydride or imide group from the local C(s) symmetry, shown by MNDO calculations, causes formation of an inherently chiral chromophore constituted by the three-membered ring and neighboring carbonyls. This kind of chromophore is responsible for the observed strong Cotton effects.
Synthesis and aromatase inhibitory activity of novel 1-(4-aminophenyl)-3-azabicyclo[3.1.0]hexane- and -[3.1.1]heptane-2,4-diones
作者:Jaroslav Stanek、Alex Alder、Daniel Bellus、Ajay S. Bhatnagar、Albert Haeusler、Klaus Schieweck
DOI:10.1021/jm00108a013
日期:1991.4
to estrogens. All of them displayed enzyme-inhibiting activity, and 3-cyclohexyl derivative 2g and 3-cyclohexylmethyl derivative 1h both proved more potent (greater than 140-fold) than the clinically effective agent aminoglutethimide [3-(4-aminophenyl)-3-ethylpiperidine-2,6-dione, AG]. As with AG and its derivatives, the 1R-(+)-enantiomer of 1h was responsible for the enzyme inhibitory activity. These
Absolute Configuration of Some Chiral Cyclopropanes
作者:Kazuyoshi Nishiyama、Jun’ichi Oda、Yuzo Inouye
DOI:10.1246/bcsj.47.3175
日期:1974.12
The absoluteconfigurations of (1S : 2R)-(−)-cis-, and (1S : 2S)-(+)-trans-1-phenylcyclopropane-1,2-dicarboxylic acids, and (1S : 2R)-(−)-cis-, and (1S : 2S)-(+)-trans-1-phenyl-1,2-bis(acetoxymethyl)cyclopropanes were established by correlation to (R)-(−)-2,2-diphenylcyclopropane-1-carboxylic acid.
Nickel‐Catalyzed Asymmetric Hydroaryloxy‐ and Hydroalkoxycarbonylation of Cyclopropenes
作者:Rongrong Yu、Song‐Zhou Cai、Can Li、Xianjie Fang
DOI:10.1002/anie.202200733
日期:2022.9.5
Highly enantioselective inter- and intramolecular Ni-catalyzed hydroalkoxycarbonylation yields various enantioenriched polysubstituted cyclopropanecarboxylic derivatives with quaternary carbon stereocenters.
高度对映选择性的分子间和分子内 Ni 催化的氢化烷氧基羰基化产生各种具有季碳立体中心的对映富集的多取代环丙烷羧酸衍生物。
Substituierte Azabicycloalkane, ihre Verwendung, pharmazeutische Präparate, welche diese Verbindungen enthalten, und Verfahren zur Herstellung dieser Verbindungen