Construction of Chiral Cyclobutanone-Fused 4-Aminoquinolines via Sequential Chiral Phosphoric Acid and Palladium Catalysis

J Org Chem. 2023 Apr 7;88(7):4627-4632. doi: 10.1021/acs.joc.3c00098. Epub 2023 Mar 23.

Abstract

A one-pot catalytic asymmetric route to novel chiral quaternary-carbon-containing cyclobutanone-fused 4-aminoquinoline derivatives in good to high yields and enantioselectivities is described. This process consists of a chiral phosphoric acid-catalyzed desymmetric carbonyl-amine condensation of prochiral cyclobutane-1,3-diones with 2-halogenated anilines and a Pd-catalyzed coupling reaction of the chiral enaminone intermediates with isocyanides.