Chiral bromine–lithium exchange catalyzed by diamines
作者:Quentin Perron、Jezabel Praz、Alexandre Alexakis
DOI:10.1016/j.tetasy.2009.02.027
日期:2009.5
Different classes of prochiral polyhalide compounds have been tested in a chiral bromine-lithium exchange in the presence of different diamines with enantiomeric excesses of up to 63%. (c) 2009 Elsevier Ltd. All rights reserved.
First Modular Synthesis of Dissymmetric Biaryldiphosphine Ligands Allowing Tunable Steric and Electronic Effects
作者:Frédéric R. Leroux、Hanspeter Mettler
DOI:10.1002/adsc.200600300
日期:2007.2.5
The first modularsynthesis of a family of C1-symmetricdiphosphine ligands is presented. Their synthesis is based on unprecedented highly regioselective halogen/metal interconversions on a common polybrominated biaryl precursor. This methodology allows the functionalization of the ortho- and ortho′-positions of the biaryl core. Diphosphine ligands carrying only one substituent at the 6-position and