Asymmetric Catalysis with Silicon-Based Cuprates: Enantio- and Regioselective Allylic Substitution of Linear Precursors
作者:Alexander Hensel、Martin Oestreich
DOI:10.1002/chem.201501371
日期:2015.6.15
linear allylic phosphates that makes use of catalytically generated cuprate‐type siliconnucleophiles is reported. The method relies on soft bis(triorganosilyl) zincs as silicon pronucleophiles that are prepared in situ from the corresponding hard lithium reagents by transmetalation with ZnCl2. With a preformed chiral N‐heterocyclic carbene–copper(I) complex as catalyst, exceedingly high enantiomeric excesses
Asymmetric Synthesis of α-Chiral Allylic Silanes by Enantioconvergent γ-Selective Copper(I)-Catalyzed Allylic Silylation
作者:Lukas B. Delvos、Devendra J. Vyas、Martin Oestreich
DOI:10.1002/anie.201300648
日期:2013.4.22
way: Regio‐ and enantioselective allylic substitution with a silicon nucleophile generated by copper(I)‐catalyzed SiB bond activation provides direct access to α‐chiral allylicsilanes from linear acceptors. The enantioconvergent catalysis employing McQuade's six‐membered N‐heterocyclic‐carbene–copper(I) catalyst is applicable to aryl‐ and alkyl‐substituted allylic phosphates (see scheme).
Enantioselective Synthesis of Allylsilanes Bearing Tertiary and Quaternary Si-Substituted Carbons through Cu-Catalyzed Allylic Alkylations with Alkylzinc and Arylzinc Reagents
作者:Monica A. Kacprzynski、Tricia L. May、Stephanie A. Kazane、Amir H. Hoveyda