Enantioselective Diels−Alder Reaction of Simple α,β-Unsaturated Ketones with a Cinchona Alkaloid Catalyst
作者:Ravi P. Singh、Keith Bartelson、Yi Wang、Heng Su、Xiaojie Lu、Li Deng
DOI:10.1021/ja078251w
日期:2008.2.1
The simple α,β-unsaturated ketones and 2-pyrones are readily available and synthetically important dienophiles and dienes, respectively, for Diels−Alder reactions. However, both prove to be challenging substrates for catalytic asymmetric Diels−Alder reactions. By exploring a new catalysis strategy featuring cooperative catalysis with readily available cinchona catalysts, an unprecedented asymmetric
Organocatalytic Enantioselective Diels–Alder Reaction of 2‐Trifluoroacetamido‐1,3‐dienes with α,β‐Unsaturated Ketones
作者:Xin‐Qi Zhu、Qian Wang、Jieping Zhu
DOI:10.1002/anie.202214925
日期:2023.1.2
CPA-catalyzed annulation of 2-trifluoroacetamido-1,3-dienes with α,β-unsaturated carbonyl compounds affords highly functionalized 1-trifluoroacetamido cyclohex-1-ene derivatives 3 in high yields with excellent diastereo- and enantioselectivities. An asymmetric three-component reaction of 1, 2 and ortho-hydroxybenzhydryl alcohols 4 provides the densely functionalized hexahydroxanthenes with concurrent