Desymmetrization construction of chiral lactones by synergistic Cu(II) complex and organic base
摘要:
A highly enantioselective construction of quaternary carbon center has been realized by the desymmetrization strategy. Chiral enol lactones with up to 95% ee could be synthesized from prochiral dialkynoic acid under the catalysis of synergistic chiral Cu(II) complex and chiral (DHQ)(2)-PHAL base. (C) 2020 Elsevier Ltd. All rights reserved.
Non-Enzymatic Kinetic Resolution and Desymmetrization of α-Quaternary Carboxylic Acids via Chiral Bifunctional Sulfide-Catalyzed Bromolactonization
作者:Ken Okuno、Mana Hiraki、Bun Chan、Seiji Shirakawa
DOI:10.1246/bcsj.20210347
日期:2022.1.15
Kineticresolution of racemic carboxylic acids is a reliable method to enantioselectively prepare chiral carboxylic acids. Although efficient catalytic kineticresolutions of chiral α-tertiary carboxylic acids have been reported, the kineticresolution of α-quaternary carboxylic acids bearing an all-carbonquaternary stereocenter has remained a formidable challenge. Herein, we report a precious example