Chiral Sulfinyl-Based Olefin Ligands for Rhodium-Catalysed Asymmetric Conjugate Addition of Arylboronic Acids to Cyanoalkenes
作者:Feng Xue、Yong Zhu、Xiaolei Qi
DOI:10.3184/174751918x15287224792440
日期:2018.6
A rhodium/sulfinyl-based olefin ligand-catalysed asymmetric conjugate addition of arylboronic acids to cyanoalkenes without activation groups has been developed, where p-tolylsulfinyl-functionalised olefin ligands have been shown to be effective and with moderate enantioselectivities. This is the first example of applying chiral sulfinyl-based olefin ligands in the catalytic asymmetric addition to
Copper-Catalyzed 1,4-Addition of Organoboronates to Alkylidene Cyanoacetates: Mechanistic Insight and Application to Asymmetric Catalysis
作者:Keishi Takatsu、Ryo Shintani、Tamio Hayashi
DOI:10.1002/anie.201008196
日期:2011.6.6
In addition: A copper/N‐heterocyclic carbene(NHC)‐catalyzed 1,4‐addition of organoboronates to alkylidene cyanoacetates was developed, in which the catalytic cycle is proposed to consist of a transmetalation/insertion/ligand exchange. An effective asymmetric variant has also been achieved by the use of a chiral NHC ligand (see scheme).
Palladium-Catalyzed Asymmetric Benzylic Alkylation of Active Methylene Compounds with α-Naphthylbenzyl Carbonates and Pivalates
作者:Sho Tabuchi、Koji Hirano、Masahiro Miura
DOI:10.1002/anie.201602075
日期:2016.6.6
Pd/(R)‐H8‐BINAP‐catalyzed asymmetric benzylic alkylation of active methylene compounds has been developed. The reaction proceeds without the use of an external base, and the starting racemic diarylmethyl carbonates are converted into the optically active coupling products which contain the benzylic chiral stereocenter by a dynamickineticasymmetrictransformation (DYKAT). Additionally, with suitable