Binaphthol-Catalyzed Asymmetric Conjugate Arylboration of Enones
摘要:
Conjugate addition of arylboronates to alpha,beta-unsaturated ketones may be catalyzed by chiral binaphthols with enantioselectivities of up to 99:1. Best results were observed with 3,3'-dichloro-BINOL. This chemistry was applied to syntheses of intermediates for syntheses of (+)-indatraline and (+)-tolterodine.
Evaluation of Palladacycles as a Non-Rhodium Based Alternative for the Asymmetric Conjugate 1,4-Addition of Arylboronic Acids to α,β-Unsaturated Enones
作者:Jonathan Wong、Kennard Gan、Houguang Jeremy Chen、Sumod A. Pullarkat
DOI:10.1002/adsc.201400473
日期:2014.11.3
AbstractThe asymmetric conjugate 1,4‐addition of arylboronic acids to α,β‐unsaturated carbonyl compounds is an extremely versatile and widely used organic transformation. While the rhodium(I)‐catalysed reaction has been thoroughly explored, the asymmetric palladium‐catalysed protocol is far less developed and understood, particularly with acyclic enones as substrates. Herein, we report the systematic evaluation of a series of metallacycles for this reaction and the conjugate addition of arylboronic acids to a wide range of α,β‐unsaturated enones, catalysed by an easily accessible and robust chiral phosphapalladacycle in high yields and enantioselectivities.magnified image
Binaphthol-Catalyzed Asymmetric Conjugate Arylboration of Enones
作者:Heather M. Turner、Jignesh Patel、Nootaree Niljianskul、J. Michael Chong
DOI:10.1021/ol202391r
日期:2011.11.4
Conjugate addition of arylboronates to alpha,beta-unsaturated ketones may be catalyzed by chiral binaphthols with enantioselectivities of up to 99:1. Best results were observed with 3,3'-dichloro-BINOL. This chemistry was applied to syntheses of intermediates for syntheses of (+)-indatraline and (+)-tolterodine.