Enantiomerically Pure<i>cis-</i>and<i>trans</i>-2-Substituted Cyclopropanols from Allylic Sulfones
作者:David Díez、Pilar García、Isidro S. Marcos、Narciso M. Garrido、Pilar Basabe、Julio G. Urones
DOI:10.1055/s-2003-36256
日期:——
Enantiomerically pure cis- and trans-2-substituted cyclopropanols have been obtained from allylic sulfones derived from (R)-glyceraldehyde, in good yields.
立体异构纯的顺式和反式2-取代环丙醇已从源自(R)-甘油醛的烯丙基磺酮中以良好的产率获得。
Chemistry of vinyl sulfones. Approach to novel conformationally restricted analogues of glutamic acid
作者:David Díez、P. García、Isidro S. Marcos、N.M. Garrido、P. Basabe、Howard B. Broughton、Julio G. Urones
DOI:10.1016/j.tet.2004.10.072
日期:2005.1
A totally different approach to conformationally restricted glutamic acid analogues is described, in which one of the acid functions is replaced by a cyclopropanol. The reactivity of cyclopropanol vinyl sulfones toward addition of lithiated Schollkopf bislactim ether provides a facile synthesis of a-amino acid diastereoisomers. Conformational analysis of these analogues, incorporating solvation effects, and docking to a glutamate receptor model, are used to show the relevance of the conformational restrictions employed. (C) 2004 Elsevier Ltd. All rights reserved.
Stereocontrolled Synthesis of Cyclopropanol Amino Acids from Allylic Sulfones: Conformationally Restricted Building Blocks
作者:David Díez、P. Garcia、Isidro S. Marcos、N. M. Garrido、P. Basabe、Howard B. Broughton、Julio G. Urones
DOI:10.1021/ol035451d
日期:2003.10.1
[reaction: see text] A new aminoacid methyl ester with a cyclopropanol has been synthesized starting from the allyl sulfone 10. The starting material, 10, could be obtained in both enantiomeric forms. The stereoselectivity of the cyclopropane formation has been studied by molecular modeling.
Vinylsulfones as Nucleophiles and Michael Acceptors in the Same Step: Stereoselective Synthesis of Amino Acid Precursors
作者:David Díez、Pilar García、R. F. Moro、Isidro S. Marcos、Pilar Basabe、Narciso M. Garrido、Howard B. Broughton、Julio G. Urones
DOI:10.1055/s-2005-870005
日期:——
Several precursors of unnatural amino acids have been synthesized by addition of vinyl sulfones to an imine derived from (R)-glyceraldehyde. In these reactions the addition not only takes place in a stereoselective way, but a hydride transfer is also produced giving rise to the saturated sulfones and a new imine.