56280-66-1Relevant academic research and scientific papers
Quaternary carbon stereogenic centers through copper-catalyzed enantioselective allylic substitutions with readily accessible aryl- or heteroaryllithium reagents and aluminum chlorides
Gao, Fang,Lee, Yunmi,Mandai, Kyoko,Hoveyda, Amir H.
, p. 8370 - 8374 (2010/12/25)
The case of the notorious aryls is solved: The first efficient catalytic and enantioselective method for allylic substitutions 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.
Copper-catalyzed asymmetric conjugate addition of aryl aluminum reagents to trisubstituted enones: Construction of aryl-substituted quaternary centers
Hawner, Christine,Li, Kangying,Cirriez, Virginie,Alexakis, Alexandre
, p. 8211 - 8214 (2009/04/13)
(Chemical Equation Presented) Al be back: Novel aryl and alkenyl aluminum reagents are generated through a halogen/Li exchange-Li/Al transmetalation sequence. These aryl alanes are used in the copper-catalyzed asymmetric conjugate addition reaction to a variety of cyclic enones giving chiral aryl-substituted quaternary centers (see scheme). Both, electron-donating and electron-withdrawing groups give full conversion and very good ee values.
