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
An Enantioselective Iodolactonization/Cross-Coupling Protocol for the Synthesis of Highly Substituted Enol Lactones
作者:Christoph Fricke、Michael Wilking、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1002/ejoc.201800642
日期:2018.6.29
A sequence of catalytic enantioselectiveiodolactonization followed by Palladium‐catalyzed cross‐coupling provides rapid access to highly substituted enol lactones. With DHQD2PHAL as catalyst, moderate to very good enantioselectivities in the iodolactonization step can be obtained.
Desymmetrization construction of chiral lactones by synergistic Cu(II) complex and organic base
作者:Murad Ali、Changkun Li
DOI:10.1016/j.tetlet.2020.152106
日期:2020.7
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.