Magnesium triflate [Mg(OTf)2] a highly stable, non-hygroscopic and a recyclable catalyst for the high yielding preparation of diethyl α-trimethylsilyloxyphosphonates from diethyl α-hydroxyphosphonates by HMDS under solventless conditions
and convenient procedure for the easy conversion of various α-hydroxyphosphonates to α-trimethylsilyloxyphosphonates under mild conditions with HMDS in the presence of a catalytic amount of magnesium triflate as a highly stable and a non-hygroscopic recyclable catalyst in neat conditions is described. In order to show the general applicability of this method, we have also applied this procedure successfully
Aluminium Triflate [Al(OTf)<sub>3</sub>] as a Recyclable Catalyst for the Conversion of α-Hydroxyphosphonates, Alcohols and Phenols to Their Corresponding O-Silylated Products with Hexamethyldisilazane (HMDS)
Al(OTf)3 as a recyclable catalyst conducts the efficient conversion of various types of α-hydroxyphosphonates to their corresponding α-trimethysilyloxyphosphonates with HMDS in the absence of solvent at room temperature. The general applicability of the catalyst under solvent-free conditions is demonstrated by applying it for the successful silylation of alcohols and phenols with HMDS in high yields.
Some rearrangements of unsaturated phosphonate esters
作者:Dianne Cooper、Stuart Trippett
DOI:10.1039/p19810002127
日期:——
α-Hydroxyalk-2-enylphosphonates undergo Claisen orthoester rearrangement on heating with orthoesters, and their arylsulphenates undergo [2,3]-sigmatropic rearrangement to give 3-arylsulphinylalk-1-enylphosphonates. The addition of allyloxide anion to the central carbon of the allene Me2CCCHP(O)(OEt)2 is followed by rapid Claisen rearrangement of the resulting allylic carbanion to give the two possible
与原酸酯一起加热时,α-羟基烷-2-烯基膦酸酯会发生Claisen原酸酯重排,其芳基磺酸酯会发生[2,3]-σ重排,从而生成3-芳基亚磺酰基烷基-1-烯基膦酸酯。在烯丙基Me 2 C C CHP(O)(OEt)2的中心碳上添加烯丙氧基阴离子后,对所得的烯丙基碳负离子进行快速克莱森重排,得到两种可能的β-酮烷基膦酸酯。已制备出通式为R 1 R 2 C CH [CH 2 ] n CR 3 C CHP(O)(OEt)2的烯丙基膦酸酯:当R 1 = R 2时= H,R 3= Me,且n= 2,发生对映体重排以得到异构二烯;α= H,R 3= Me,n= 2。当R 1,R 2,R 3= Me且n= 0时,[1,5]氢化物转移得到三烯,然后环化成环己二烯;当R 1 = Me,R 2 = H,R 3 = H或Me且n = 0时,二烯组分可用于Diels–Alder反应。
Activation anionique du phosphite de diethyle par le fluorure de potassium depose sur alumine, synthese de phosphonates fonctionalises
作者:Didier Villemin、Rassem Racha
DOI:10.1016/s0040-4039(00)84375-0
日期:1986.1
Dry reactions of diethylphosphite on KF-Al2O3 with different. electrophiles conduct to the synthesis of functionalized phosphonates.
亚磷酸二乙酯在KF-Al 2 O 3上的干反应有不同。亲电试剂可进行功能化膦酸酯的合成。
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