Enantioselective Synthesis of Difluoroalkylated Isoindolinones via Chiral Spirocyclic Phosphoric Acid Catalyzed Mannich-Type Reaction
作者:Xufeng Lin、Lei Wang、Jialing Zhong
DOI:10.1055/a-1274-2959
日期:2021.3
An enantioselective Mannich-type reaction of in situ generated cyclic ketimines with difluoroenoxysilanes catalyzed by chiral spirocyclic phosphoric acid has been developed. This methodology provides a facile route to difluoroalkyl-substituted chiral isoindolinones bearing a quaternary stereogenic center in high yields and up to 96% enantioselectivity.
The enantioselective hydrogenolysis of racemic 3-aryl-3-hydroxyisoindolin-1-ones catalyzed by BINOL-derived chiral phosphoric acid with benzothiazoline as the hydride source is described. The corresponding cyclic diaryl methylamines are obtained in good to excellent yields and up to 91% enantioselectivities. (C) 2013 Elsevier Ltd. All rights reserved.