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
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
DOI:10.1002/anie.200700841
日期:2007.6.11
Quaternary Carbon Stereogenic Centers through Copper-Catalyzed Enantioselective Allylic Substitutions with Readily Accessible Aryl- or Heteroaryllithium Reagents and Aluminum Chlorides
作者:Fang Gao、Yunmi Lee、Kyoko Mandai、Amir H. Hoveyda
DOI:10.1002/anie.201005124
日期:2010.11.2
of the notorious aryls is solved: The first efficient catalytic and enantioselective method for allylicsubstitutions that furnish quaternary carbon stereogenic centers by additions of aryl‐ or heteroarylmetals is reported (see scheme). Highly site‐ and enantioselective processes begin with readily available organolithium reagents.