Organocatalytic one-pot asymmetric synthesis of 2-aryl-2,3-dihydro-4-quinolones
作者:Gao-Fei Pan、Li Su、Yan-Lei Zhang、Shi-Huan Guo、Yong-Qiang Wang
DOI:10.1039/c6ra01247g
日期:——
A highly efficient organocatalyticone-pot enantioselective synthesis of (R)-2-aryl-2,3-dihydro-4-quinolones from o-aminoacetophenones and aryl aldehydes has been developed. The approach is characterized by being metal free, solvent free and protecting group free. A variety of 2-aryl-2,3-dihydro-4-quinolones could be obtained in good yields up to 99% ee.
Chiral Phosphoric Acid Catalyzed Asymmetric Synthesis of 2-Substituted 2,3-Dihydro-4-quinolones by a Protecting-Group-Free Approach
作者:Kodai Saito、Yuka Moriya、Takahiko Akiyama
DOI:10.1021/acs.orglett.5b01654
日期:2015.7.2
Chiral 2-substituted 2,3-dihydro-4-quinolones were synthesized based on the chiral phosphoric acid catalyzed intramolecular aza-Michael addition reaction using N-unprotected 2-aminophenyl vinyl ketones as substrates in good yields with high enantioselectivities.
The kinetic resolution of a carbon nucleophile is realized for the first time via Pd-catalyzed asymmetricallylicalkylation with "unstabilized" ketone enolates as the nucleophile, providing both allylated 2,3-disubstituted 2,3-dihydro-4-quinolones and recovered substrates in high yields and high ee (S-factor is 40-145). The application of the methodology in organic synthesis is demonstrated by the
Asymmetric Synthesis of 2-Aryl-2,3-dihydro-4-quinolones by Rhodium-Catalyzed 1,4-Addition of Arylzinc Reagents in the Presence of Chlorotrimethylsilane
[reaction: see text] The first catalytic asymmetricsynthesis of 2-aryl-2,3-dihydro-4-quinolones has been developed by way of a rhodium-catalyzed 1,4-addition of arylzinc reagents to 4-quinolones. These 1,4-adducts can be obtained with high enantioselectivity by the use of (R)-binap as a ligand, and high yields are realized by conducting the reactions in the presence of chlorotrimethylsilane.