Phosphoramidites with the general formulae I to VI are claimed together with the use of these compounds as ligands of transition metal compounds, in particular in transition metal catalysts, in the hydrogenation, transfer hydrogenation, hydroboration, hydrocyanation, 1,4-addition, hydroformylation, hydrosilylation, hydrovinylation, and Heck reactions of prochiral olefins, ketones, or ketimines.
Why Are BINOL-Based Monophosphites Such Efficient Ligands in Rh-Catalyzed Asymmetric Olefin Hydrogenation?
作者:Manfred T. Reetz、Andreas Meiswinkel、Gerlinde Mehler、Klaus Angermund、Martin Graf、Walter Thiel、Richard Mynott、Donna G. Blackmond
DOI:10.1021/ja052025+
日期:2005.7.1
based on BINOL-derived monodentate phosphites have resulted in an efficient and economically attractive preparative method, very little is known concerning the source of the unexpectedly high levels of enantioselectivity (ee often 90-99%). The present mechanistic study, which includes the NMR characterization of the precatalysts, kinetic measurements with focus on nonlinear effects, and DFT calculations
Solid-Phase Parallel Synthesis of Phosphite Ligands
作者:Bert H. G. Swennenhuis、Ruifang Chen、Piet W. N. M. van Leeuwen、Johannes G. de Vries、Paul C. J. Kamer
DOI:10.1021/ol703070x
日期:2008.3.1
Various routes for the synthesis of polymer-bound phosphites and phosphoramidites have been investigated. In the presence of a suitable activator the supported phosphoramidites react cleanly with alcohols to give the corresponding monodentate phosphite ligands in solution. We have applied this novel solid-phase route in the parallel synthesis of several monodentate chiral and achiral phosphite ligands.
US7704912B2
申请人:——
公开号:US7704912B2
公开(公告)日:2010-04-27
Phosphonate Modification for a Highly (Z)-Selective Synthesis of Unsaturated Esters by Horner-Wadsworth-Emmons Olefination
作者:Fran�ois P. Touchard
DOI:10.1002/ejoc.200400769
日期:2005.5
The Horner–Wadsworth–Emmons (HWE) reaction of various ethyl diarylphosphonoacetates with benzaldehyde, cyclohexane carboxaldehyde and octanal is reported. Selectivities of up to 98 % at –78 °C are obtained with the three substrates. Among all the phosphonates prepared, the reagent based on 2-tert-butylphenol proved to be especially efficient, with Z/E ratios close to 95:5 at 0 °C. It appears thus to