Enantioselective Primary Amine Catalyzed Aldol-Type Construction of Trifluoromethylated Tertiary Alcohols
作者:Li Li、Li-Wen Xu、Wei Yang、Yu-Ming Cui、Wei Zhou、Ke-Fang Yang、Zhan-Jiang Zheng、Yixin Lu
DOI:10.1055/s-0033-1341281
日期:——
cinchona-derived primary amines and their combined catalyst systems with chiral organic acid or Lewis acid have been successfully applied in the cross-aldol reaction of trifluoromethyl ketones and aliphatic ketones. Excellent yields and good enantioselectivities (up to 89% ee) of the resulting β-trifluoromethyl-β-hydroxy ketones were obtained in the chiral primary amine catalyzed cross-aldol reaction under different
can be prepared by the catalytic enantioselective cross-aldol reaction of acetone with trihalomethyl ketones by usingN-(8-quinolinesulfonyl)prolinamide as an organocatalyst. The MO calculations elucidate that the hydrogen bonding between the sulfonimide proton and the 8-quinolyl nitrogen atom plays an important role in exerting the enantioselectivity of the reaction.
Fine-Tuning the Structures of Chiral Diamine Ligands in the Catalytic Asymmetric Aldol Reactions of Trifluoromethyl Aromatic Ketones with Linear Aliphatic Ketones
作者:Hua Zong、Huayin Huang、Guangling Bian、Ling Song
DOI:10.1021/jo5022103
日期:2014.12.5
series of N,N-disubstituted chiral diamine ligands on the catalytic asymmetric aldol reactions between trifluoromethyl ketones and linear aliphaticketones for the construction of chiral trifluoromethyl tertiary alcohols. A highly efficient primary–tertiary diamine ligand derived from (1R,2R)-1,2-diphenylethylenediamine was developed, which catalyzed the reactions with up to 99% yield and up to 94%