Stereoselective syntheses of 1,2-dialkyl-1-phenyl cyclopentanes involving intramolecular carbolithiation of α-thioalkenes
作者:Alain Krief、Benoît Kenda、Bruno Remacle
DOI:10.1016/0040-4020(96)00261-x
日期:1996.5
2-Ethyl-1-methyl-1-phenyl cyclopentane, unavailable by butyllithium-promoted carbocyclisation of the corresponding alkenyl selenide, has been synthesized from 6-methylseleno-6-phenyl-1-phenylthio-1-heptene and 7-methylseleno-7-phenyl-2-phenylthio-2-octene with high stereocontrol at all the three stereogenic centers. Depending upon the solvent used, the derivative in which the methyl- and the phenylthiomethyl
Formalizing the mechanism of the allylic substitution reaction (SN’): application to the highly enantio- and diastereo-selective syntheses of 1-phenyl-2-vinyl-cyclopentanes
We report efficient stereoselective and high yielding syntheses of each of the four enantiomers of phenylcyclopentanes bearing a quaternary center and a E-propenyl chain on the adjacent carbon that involves intramolecular allylicsubstitution reactions. In complement to its synthetic value, this process models the SN’ reaction and allows prediction of its stereochemical outcome.
作者:M. Clarembeau、A. Cravador、W. Dumont、L. Hevesi、A. Krief、J. Lucchetti、D. Van Ende
DOI:10.1016/s0040-4020(01)96719-5
日期:1985.1
Regioselective syntheses of polycyclic compounds by carbanion-mediated polycyclisation of olefins.
作者:A. Krief、P. Barbeaux
DOI:10.1016/s0040-4039(00)92643-1
日期:1991.1
This paper reports straightforward syntheses of 1-aryl-bicyclo-[n.1.0]-alkanes, 1-aryl-bicyclo-[3.3.0]-alkanes and of 1-phenyl-1,4-dimethyl-cyclopentane from unsaturated benzylselenides which involve the organolithimus-medicated cyclisation of olefins and poly-olefins.