Stereocontrolled Reactions Mediated by a Remote Sulfoxide Group: Synthesis of Optically Pure anti-β-Amino Alcohols
摘要:
A one-step synthesis of enantiomerically pure anti-1,2-amino alcohol derivatives has been achieved by reaction of prochiral oxygenated 2-p-tolylsulfinylbenzyl carbanions with N-sulfinylimines bearing the same configuration at sulfur.
Synthesis of Enantiopure Sulfinimines (Thiooxime S-Oxides) Catalyzed by Yb(OTf)3 from p-Toluenesulfinamide and Aldehydes in Mild Reaction Conditions
摘要:
Enantiomerically pure sulfinimines as important building blocks in the asymmetric synthesis of amine derivatives are prepared in good to excellent yields from chiral p-toluenesulfinamide with aromatic, heteroaromatic, and aliphatic aldehydes. The unprecedented feature of the reported procedure is that the formation of the sulfinimines was achieved by the catalytic action of Yb(OTf)(3) in THF at room temperature. The reaction conditions were also applicable to Ellman's sulfinimines.
Asymmetric Aza-Henry Reactions from <i>N</i>-<i>p</i>-Tolylsulfinylimines
作者:José Luis García Ruano、Markus Topp、Jesús López-Cantarero、José Alemán、Modesto J. Remuiñán、M. Belén Cid
DOI:10.1021/ol051580d
日期:2005.9.1
[reaction: see text] N-Sulfinylimines derived from aromatic or aliphatic aldehydes and ketones react with nitromethane and NaOH in a highly diastereoselective manner under mild conditions. In the presence of TBAF, the reaction rates are strongly increased and the stereoselectivity is inverted. This method provides enantiomerically pure beta-nitroamines derived from enolizable aldimines and ketimines
Optically pure trans-2,3-disubstituted N-sulfinyl aziridines. Regio- and stereoselective opening mediated by the sulfinyl group
作者:Yolanda Arroyo、Ángela Meana、J. Félix Rodríguez、Mercedes Santos、M. Ascensión Sanz-Tejedor、José L. García-Ruano
DOI:10.1016/j.tet.2006.06.072
日期:2006.9
A newentry to optically pure trans-2,3-disubstituted N-sulfinyl aziridines starting from 1,2-aminosulfides, involving formation of a sulfonium salt intermediate followed by intramolecular nucleophilic attack by the sulfinamide nitrogen atom, is reported. The regio- and stereoselective opening of the aziridine ring can be achieved by anchimeric assistance of the sulfinyl group.
Preparation of α-amino ketones, β-amino hydroxylamines using asymmetric aza-Henry reactions of N-p-tolylsulfinylimines with nitroethane
作者:José Luis García Ruano、Jesús López-Cantarero、Teresa de Haro、José Alemán、M. Belén Cid
DOI:10.1016/j.tet.2006.10.021
日期:2006.12
N-Sulfinylimines derived from aromatic and aliphatic aldehydes react with nitroethane and NaOH, yielding mainly two diastereoisomeric β-nitroamines as the result of a highly diastereoselective reaction and further epimerization of the carbon linked to the nitro group. The resulting β-nitroamines are used as precursors of N-sulfonyl α-amino methyl ketones and β-amino hydroxylamines.
A New Access to the Synthesis of Optically Pure β-Aminosulfides
作者:Y. Arroyo、A. Meana、J. F. Rodríguez、M. Santos、M. A. Sanz-Tejedor、J. L. García Ruano
DOI:10.1080/10426500590913320
日期:2005.3.2
Stereocontrolled Reactions Mediated by a Remote Sulfoxide Group: Synthesis of Optically Pure <i>a</i><i>nti</i>-β-Amino Alcohols
作者:José L. García Ruano、José Alemán
DOI:10.1021/ol0358410
日期:2003.11.1
A one-step synthesis of enantiomerically pure anti-1,2-amino alcohol derivatives has been achieved by reaction of prochiral oxygenated 2-p-tolylsulfinylbenzyl carbanions with N-sulfinylimines bearing the same configuration at sulfur.