New Catalyst for Phosphonylation of C˭X Electrophiles
作者:Oleg I. Kolodiazhnyi、Olga O. Kolodiazhna
DOI:10.1080/00397911.2010.542602
日期:2012.6
recyclable catalyst for the reaction of trialkylphosphites with various C˭X electrophiles (aldehydes, ketones, ketophosphonates, imines, isocyanates, isothiocyanates, activated alkenes) to afford corresponding α-substituted phosphonates in good yields. The main advantages of the new catalyst is strong activity, accessibility, good yields of products, and gentle conditions of reaction. GRAPHICAL ABSTRACT
The Preparation of Dimethyl α -Hydroxyphosphonates and the Chemical Shift Non-Equivalence of Their Diastereotopic Methyl Ester Groups
作者:Harry R. Hudson、Ramon O. Yusuf、Ray W. Matthews
DOI:10.1080/10426500701690905
日期:2008.6.9
alkanals, aryl aldehydes (or aryl methyl ketones), furfuraldehyde, and 2- or 3-thiophenecarboxaldehyde, respectively, thus confirming the general utility of this synthetic procedure. The 1H and 13C nmr spectra of the products exhibit characteristic chemical shift non-equivalence of the diastereotopic methyl ester groups, for which a tentative order of non-equivalence is reported and discussed.
Mechanistic approach for expeditious and solvent-free synthesis of α-hydroxy phosphonates using potassium phosphate as catalyst
作者:Makarand A. Kulkarni、Uday P. Lad、Uday V. Desai、Satish D. Mitragotri、Prakash P. Wadgaonkar
DOI:10.1016/j.crci.2012.10.009
日期:2013.2
Résumé An extremely simple, high yielding, highly rapid and solvent-free protocol has been described for hydrophosphylation of aldehydes using potassium phosphate as catalyst. Easy commercial availability of the reusable catalyst, operational simplicity at ambient temperature and avoidance of conventional work-up as well as purification procedure makes this solvent-free protocol a near-ideal synthesis. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.pdf
An Efficient Synthesis of α‐(2,4‐Dichloro‐phenoxyacetoxy)aryl Methyl Phosphonate Monosodium Salts
作者:Tao Wang、Hong Wu He
DOI:10.1081/scc-120030691
日期:2004.12.31
Abstract A series of α‐(2,4‐dichlorophenoxyacetoxy)aryl methyl phosphonate monosodium salts 6 were synthesized by the reaction of the intermediate 5 with sodium iodide under moderate condition. This method was applied to the synthesis of novel phosphonate derivatives containing sensitive groups such as carboxylic ester to acid, base, or water.
SIMPLE AND IMPROVED PREPARATION OF α-OXOPHOSPHONATE MONOLITHIUM SALTS
作者:Tao Wang、Hong Wu He
DOI:10.1080/10426500490474941
日期:2004.10.1
Some α-OxoPhosphonate monolithium salts were synthesized by a facile one-step procedure. In this way, α-(2,4-dichlorophenoxyacetoxy)alkyl phosphonic acid dimethyl esters 5 can be transformed into the corresponding phosophonate monolithium salts 6 without influence on the carboxylic ester group under mild conditions.