Chiral Primary Amine/Palladium Dual Catalysis for Asymmetric Allylic Alkylation of β-Ketocarbonyl Compounds with Allylic Alcohols
作者:Han Zhou、Long Zhang、Changming Xu、Sanzhong Luo
DOI:10.1002/anie.201505946
日期:2015.10.19
promote the direct asymmetric allylic alkylation (AAA) of β‐ketocarbonyl compounds. In particular, the synergistic dual catalytic system enabled the AAA reaction of challenging acyclic aliphatic ketones, such as β‐ketocarbonyl compounds and 1,3‐diketones.
π-Coordinating Chiral Primary Amine/Palladium Synergistic Catalysis for Asymmetric Allylic Alkylation
作者:Yaning Wang、Junli Chai、Chang You、Jie Zhang、Xueling Mi、Long Zhang、Sanzhong Luo
DOI:10.1021/jacs.9b13026
日期:2020.2.12
synergistic catalysis for asymmetric allylic alkylation of α-branched β-ketocarbonyls. The use of arene-containing chiral primary amine catalyst led to not only enhanced reaction rate but also reversed chiral induction comparing with its sterically bulky derivative. Both enantiomers of the allylic adducts bearing acyclic all-carbon quaternary stereocenters could be obtained from the same configured chiral aminocatalyst
Asymmetric induction reactions. V. The palladium-catalyzed asymmetric .alpha.-allylation of carbonyl compounds with chiral allyl esters via enamines and imines
A novel and excellent method for asymmetric alpha-allylation of carbonyl compounds via their chiral enamines or imines bearing allyl eaters has been developed. Readily available chiral allyl eaters having chirality at the alpha-position of the eater carbonyl group, such as (S)-proline and other (S)-alpha-amino acid allyl esters, have been found to serve as good asymmetric allylating reagents in palladium-catalyzed reactions of the chiral enamines and imines derived from them. The use of (S)-proline or (S)-valine allyl esters as the amino parts in the enamines or imines provided the highest optical yields of the corresponding alpha-allyl carbonyl compounds. A mechanism for asymmetric induction is proposed based on the stereochemical results obtained.
Catalytic asymmetric alkylation of α-cyanocarboxylates and acetoacetates using a phase-transfer catalyst
The catalytic asymmetric alkylation of alpha-cyanocarboxylates and acetoacetates with an alkyl halide was performed under phase-transfer conditions to afford compounds which have a chiral quaternary carbon with up to 97% and 94% ee, respectively. As applications of this method, chiral 2-oxindole derivatives and a beta-lactam derivative were synthesized. (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-catalyzed asymmetric allylations of chiral enamines bearing phosphine functionality. Effects of anionic counterparts of allylating reagents on asymmetric induction