Tandem Copper-Catalyzed Enantioselective Allylation−Metathesis
作者:Alexandre Alexakis、Karine Croset
DOI:10.1021/ol0269244
日期:2002.11.1
Grignardreagents undergo enantioselective (up to 86% ee) copper-catalyzed S(N)2' substitution on achiral allylic chlorides. The reaction is wide in scope for both the Grignardreagent and the allylic substrate. The resulting terminal alkene could be submitted to intra- or intermolecular metathesis to afford newchiral synthons. The experimental conditions are compatible with a one-pot overall sub
Highly Enantioselective Hiyama Cross-Coupling via Rh-Catalyzed Allylic Arylation of Racemic Allyl Chlorides
作者:Jesús González、Philipp Schäfer、Stephen P. Fletcher
DOI:10.1021/acs.organomet.9b00197
日期:2019.10.28
achieved through rhodium(I)-catalyzed dynamic kinetic asymmetric transformations between aryl siloxanes and cyclic racemic allyl halides. This process affords valuable enantiomerically enriched aryl-substituted cyclic allyl products and is compatible with heterocyclic allylchloride electrophiles.
Rhodium-catalysed asymmetric allylic arylation of racemic halides with arylboronic acids
作者:Mireia Sidera、Stephen P. Fletcher
DOI:10.1038/nchem.2360
日期:2015.11
couples arylboronic acids to racemic allyl chlorides. Both enantiomers of a cyclic chloride are converted into a single enantiomer of product via a dynamic kinetic asymmetric transformation. This Rh-catalysed method uses readily available and inexpensive building blocks and is mild and broadly applicable. For electron-deficient, electron-rich or ortho-substituted boronic acids better results are obtained
Processes of forming Csp2-Csp3 bonds at the allylic carbon of a cyclic allylic compound starting material are disclosed, in which a racemic mixture of a cyclic allylic compound having a leaving group attached to the allylic carbon is reacted with a compound having a nucleophilic carbon atom in the presence of a Rh(l), Pd(ll) or Cu(l) pre-catalyst and a chiral ligand. The reaction products containing the newly-formed Csp2-Csp3 bond are generated in high stereoisomeric excess, and may therefore serve as important organic building blocks in the preparation of new agrochemicals and pharmaceuticals.