Simple syntheses of hydroxamic acids and their conversion into α-hydroxy and α-amino acids
作者:Saı̈d Boukhris、Abdelaziz Souizi
DOI:10.1016/s0040-4039(00)00228-8
日期:2000.4
The nucleophilic ring opening of gem-dicyanoepoxides by LiBr or Li2NiBr4, in the presence of hydroxylamine derivatives leads to new α-halo hydroxamicacids. These compounds has been used in the synthesis of α-functionalized hydroxamicacids, α-hydroxy and α-amino acids in good yields.
A Facile One-Pot Synthesis of α-Hydroxy Acids and Their Derivatives
作者:Claudie Florac、Philippe Le Grel、Michèle Baudy-Floc'h、Albert Robert
DOI:10.1055/s-1991-26562
日期:——
2-Substituted oxirane-1,1-dicarbonitriles react with water, alcohols or phenol to give 2-substituted 2-hydroxyacetic acids, alkyl 2-alkoxyacetates and phenyl 2-phenoxyacetates, respectively. Reaction of 2-substituted oxirane-1,1-dicarbonitrile with thiophenol and a nucleophile, typically water ethanol or urea, gave 2-(phenylthio)acetic acids, ethyl 2-(phenylthio)acetates and N-aminocarbonyl-2-(phenylthio)acetamides.
Pyrenediones (PYDs) are efficient photocatalysts for three oxygenation reactions: epoxidation of electron deficient olefins, oxidative hydroxylation of organoborons, and oxidation of sulfides via in situgeneration of H2O2 under visible light irradiation, using oxygen as a terminal oxidant and IPA as a solvent and a hydrogen donor.
吡咯二酮(PYDs)是用于三种氧化反应的有效光催化剂:缺电子烯烃的环氧化,有机硼的氧化羟基化以及在可见光照射下通过原位生成H 2 O 2,使用氧作为末端氧化剂和IPA作为硫化物的氧化溶剂和氢供体。
Obtention d'intermediaires tetrahedriques au cours de la reaction des gem dicyanoepoxydes avec les thioamides substitues. Evolution de ces intermediaires en thiazoles mesoioniques.
作者:M. Baudy、A. Robert
DOI:10.1016/0040-4039(80)80115-8
日期:1980.1
A tetrahedral intermediate is isolated from the reaction of gem dicyanoepoxyde with 2-mercapto 1-methyl imidazole, the breakdown of this compound leads to a mesoionic imidazothiazole through a ketene intermediate.
Addition des ylures de carbonyle derives de gem-dicyanoepoxydes sur les benzylidene anilines substituees
作者:A. Robert、J.J. Pommeret、E. Marchand、A. Foucaud
DOI:10.1016/s0040-4020(01)93318-6
日期:1973.1
The reaction of substituted benzylidene anilines with 1,1-dicyano or 1-cyano 1-ethoxycarbonyl epoxides gives oxazolidines, the structures of which is established by NMR spectroscopy. The formation of oxazolidines proceeds via regiospecific addition of epoxide derived ylid to imine. The influence of ylid substituants and imine substituants on the reaction may be interpreted by interactions of the frontier