The Preparation of Optically Active β-Keto Sulfoxides by Means of an Enantiomer-differentiating Reaction of α-Lithio Aryl Methyl Sulfoxides with Chiral Carboxylates
作者:Norio Kunieda、Akira Suzuki、Masayoshi Kinoshita
DOI:10.1246/bcsj.54.1143
日期:1981.4
The reaction of α-lithio aryl methyl sulfoxides with a limited amount of chiral carboxylates (R2–CO–O–R*) was found to be an enantiomer-differentiating reaction, affording the corresponding optically active β-keto sulfoxides (3), together with optically active aryl methyl sulfoxides which have the opposite configuration. The optical purity and the predominant configuration of 3 obtained were assigned
Treatment of (−)-menthyl carboxylates(2) with 2 equiv of p-tolylsulfinylcarbanion(1) afforded the corresponding opticallyactive β-keto sulfoxides(3) together with opticallyactivemethyl p-tolyl sulfoxide. The enantiomeric purity and the predominant configuration of the products were discussed.
A new and general synthesis of chiral β-ketosulfoxides by reaction of (+)-(R)-methyl p-tolyl sulfoxide with nitriles
作者:Robert Vleggaar、Jacob G. Zeevaart
DOI:10.1016/s0040-4039(99)01951-6
日期:1999.12
The nitrile functional group is efficiently transformed into the β-ketosulfoxide moiety by reaction with the anion formed from (+)-(R)-methyl p-tolyl sulfoxide and aqueous acidic work-up of the reaction.
Synthesis of enantiomerically pure acyclic α-sulfinyl ketimines
作者:José L Garcı́a Ruano、Antonio Lorente、Jesús H Rodrı́guez Ramos
DOI:10.1016/s0957-4166(98)00211-0
日期:1998.7
Two different methods to obtain enantiomerically pure N-alkyl and N-aryl alpha-sulfinyl ketimines are reported. Reaction of enantiomerically pure alpha-sulfinyl ketones (1-6) with benzylamine or p-methoxyaniline, in the presence of molecular sieves (3 Angstrom), yields the corresponding of N-benzyl and N-p-methoxyphenyl ketimines (7A-12A and 7B-12B). Better results were achieved by alpha-sulfinylation of ketimines (13A-18A and 13B-18B) with (-)-menthyl p-toluenesulfinate in the presence of lithium (N-arylimines) or magnesium (N-benzylimines) bases. The different tautomeric behaviour of the obtained N-aryl and N-alkyl derivatives is reported. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Synthesis and stereoselective reductions of chiral β-iminosulfoxides
作者:José L. García Ruano、Antonio. Lorente、Jesús H. Rodríguez