Selective Construction of C−C and C=C Bonds by Manganese Catalyzed Coupling of Alcohols with Phosphorus Ylides
作者:Xin Liu、Thomas Werner
DOI:10.1002/adsc.202001209
日期:2021.2.16
manganese catalyzed coupling of alcohols with phosphorus ylides. The selectivity in the coupling of primary alcohols with phosphorus ylides to form carbon‐carbon single (C−C) and carbon‐carbon double (C=C) bonds can be controlled by the ligands. In the conversion of more challenging secondary alcohols with phosphorus ylides the selectivity towards the formation of C−C vs. C=C bonds can be controlled by the
Synthesis and Characterization of Pentaerythritol-Derived Oligoglycol and Their Application to Catalytic Wittig-Type Reactions
作者:Kai Li、Li Ran、Yi-Hua Yu、Yong Tang
DOI:10.1021/jo049701v
日期:2004.5.1
approach. Quantitative 13C NMR proves to be an efficient tool for the characterization of oligoglycols. The corresponding telluride of oligoglycol 17 is synthesized and used as a good catalyst for Wittig-typereactions in preparing both disubstituted and trisubstituted οlefins in good to high yields.
几种具有游离羟基的季戊四醇衍生的低聚乙二醇1可以通过收敛方法容易地制备。定量13 C NMR被证明是表征低聚乙二醇的有效工具。合成了相应的低聚乙二醇17的碲化物,并将其用作Wittig型反应的良好催化剂,以高收率或高收率制备二取代和三取代的烯烃。
Catalytic Asymmetric Synthesis with Rh−Diene Complexes: 1,4-Addition of Arylboronic Acids to Unsaturated Esters
作者:Jean-François Paquin、Corey R. J. Stephenson、Christian Defieber、Erick M. Carreira
DOI:10.1021/ol051533l
日期:2005.8.1
route to enantioenriched tert-butyl 3,3-diarylpropanoates is presented. These useful building blocks are prepared via an asymmetricrhodium-catalyzedconjugateaddition of arylboronic acids to unsaturated tert-butyl esters in the presence of chiral dienes as ligands. The addition of both electron-poor and electron-rich boronic acids proceeds smoothly with various enoates in 63-90% yield with high enantioselectivites
Soluble poly(ethylene glycol) (PEG)-supported telluride 2 was designed and synthesized for catalytic Wittig-type reactions. It was found that the catalytic loading could be reduced from 20 to 2 mol % by the introduction of PEG (even to 0.5 mol % when some telluride salts were used as the catalyst). Under the catalytic reaction conditions, a wide variety of aldehydes with different structures could
Soluble PEG-supported telluride 2 was synthesized and found to be an effective catalyst for the catalytic Wittig-typereaction to give a variety of α,β-unsaturated esters in high yields with excellent E-stereoselectivity in the presence of sodium bisulfite as well as triphenyl phosphite.