Corey–Chaykovsky Cyclopropanation of Nitronaphthalenes: Access to Benzonorcaradienes and Related Systems
作者:Damian Antoniak、Michał Barbasiewicz
DOI:10.1021/acs.orglett.9b03375
日期:2019.12.6
derivatives react as Michael acceptors in the Corey-Chaykovsky reaction with alkylphenylselenones and alkyl diphenyl sulfonium salts. Mechanistic studies reveal that sterically demanding substituents at the carbanionic center favor formation of cyclopropanes and suppress competitive β-elimination to the alkylated products. The transformation, demonstrated also on heterocyclic nitroquinoline and nitroindazolines
Drug candidates for inhibition of HIV-I replication can target Src family kinases (SFK), such as Hck, that interact with Nef protein of the virus. Compounds characterized by such inhibitory activity were identified via an assay for kinase activity of an SFK in a Nef:SFK complex. Illustrative of inhibitors identified using the kinase assay are various 2,3-diaminoquinaxolines and furo[2,3-d]pyrimidines. The inventive inhibitors were found to arrest HIV-I viral replication in vitro.
Alkylation of nitroarenes via VicariousNucleophilicSubstitution (VNS) was tested experimentally and modelled with DFT calculations. Mechanistic studies reveal intrinsic differences between reactions of archetypal carbanion precursor PhSO2CH2Cl, and alkyl phenyl sulfones, in which benzenesulfinate acts as a leaving group. Accordingly, for the latter precursors steric hindrance develops at the β-elimination
Levy, Annales de Chimie (Cachan, France), 1938, vol. <11> 9, p. 5,82
作者:Levy
DOI:——
日期:——
Conformational studies by dynamic NMR. 40. Conformational atropoisomerism in highly hindered naphthylamines
作者:S. Davalli、L. Lunazzi、D. Macciantelli
DOI:10.1021/jo00005a017
日期:1991.3
N,N-Dialkyl-1-naphthylamines substituted by alkyl groups R (R = Me, Et, i-Pr, t-Bu) in position 2 display anisochronous NMR signals owing to their twisted conformational arrangement. These conformers are enantiomerically related (conformational atropoisomers), and variable temperature NMR measurements allowed the enantiomerization barriers to be determined. The barriers increase with the increasing dimension of the substituents (covering the range 15.7-23.0 kcal mol-1), and the observed trend was reproduced by Molecular Mechanics calculations. The calculations also gave indications upon the structure of the conformers that correspond to energy minima. The final choice among the possible conformations could be achieved by comparing the computed interprotonic distances with the results of NOE experiments.