Asymmetric synthesis of cyclopropyl phosphonates using chiral terpenyl sulfonium and selenonium ylides
作者:Wanda H. Midura、Jacek Ścianowski、Anna Banach、Adrian Zając
DOI:10.1016/j.tetasy.2014.10.002
日期:2014.11
The asymmetriccyclopropanation of a vinylphosphonate using optically active sulfonium and selenonium ylides derived from (−)-menthol and (+)-limonene was developed. The ylides were generated in situ by the reaction of the corresponding sulfonium or selenonium salt in the presence of potassium carbonate or DBU as a base. The transfer of the CHPh and CHCO2Et groups into the cyclopropane ring showed
General Route to Racemic and Enantiomeric Carbo- and Heterocyclic Vinyl Sulfoxides via Tandem Michael Addition/Horner Olefination of α-Phosphorylvinyl Sulfoxides
作者:Marian Mikołajczyk、Jerzy A. Krysiak、Wanda H. Midura、Michał W. Wieczorek、Ewa Różycka-Sokołowska
DOI:10.1021/jo061463b
日期:2006.11.1
heterocyclic and carbocyclic vinyl sulfoxides has been developed which involves reaction of α-phosphorylvinyl sulfoxides with carbonyl compounds bearing oxygen, nitrogen, and carbon nucleophilic centers. Use of optically active α-phosphorylvinyl p-tolyl sulfoxides in this tandem Michael addition/Horner olefination reaction leads to the corresponding optically active cyclic sulfoxides. In this way, a variety of
Asymmetric Cyclopropanation of Optically Active Vinyl Sulfoxides: A New Synthetic Approach to Biologically Active Compounds
作者:Wanda H. Midura
DOI:10.1080/10426500590911593
日期:2005.3.2
substituents on stereochemical course of cyclopropanation of vinyl sulfoxides with stabilized and nonstabilized ylides, as well as dependence on reaction conditions, was investigated. Application of opticallyactive cyclopropanes obtained in the synthesis of conformationally constrained analogs of L-glutamic acid, the useful pharmacological tools in investigation of excitatory amino acid receptors, is presented
(+)-(S)-α-diethoxyphosphorylvinyl p-tolyl sulfoxide: A new chiral Michael acceptor and dienophile
作者:Marian Mikołajczyk、Wanda H. Midura
DOI:10.1016/s0957-4166(00)86048-6
日期:1992.12
reagent, (+)-(S)-1, was prepared from (+)-(S)s-α-diethoxy-phosphorylethyl p-tolyl sulfoxide 2 by phenylselenylation-deselenylation procedure. Its reactivity was demonstrated by diastereoselective Michael addition of ethanethiol giving rise to 3, tandem Michael addition/intramolecular Horner--Wittig reaction with 2-formyl pyrrole leading to the corresponding pyrrolizine sulfoxide 5 and cycloaddition with cyclopentadiene
the corresponding cyclopropanes in high yields. With fully deuterated dimethyl(oxo)sulfonium methylide, (CD3)2S(O)CD2, the cyclopropanation reaction occurred in a highly diastereoselective manner producing the cyclopropane 4a-d2 as a major diastereomer in which the newly formed quaternary α-carbon atom is chiral due to isotopic substitution (CH2 vs. CD2). The diastereomer 4b-d2, having the opposite configuration