Asymmetric Diels−Alder Reactions of 2-Pyrones with a Bifunctional Organic Catalyst
作者:Yi Wang、Hongming Li、Yong-Qiang Wang、Yan Liu、Bruce M. Foxman、Li Deng
DOI:10.1021/ja070859h
日期:2007.5.1
The reactions of 2-pyrones with electron-deficient dienophiles constitute a synthetically useful class of Diels−Alder reaction. By exploring cinchona alkaloid-derived organic molecules as acid−base bifunctionalcatalysts, we successfully developed the first highly enantioselective and diastereoselective catalytic Diels−Alder reaction with 2-pyrones. Furthermore, we demonstrated the possibility of using
Effective One-Pot Synthesis of 5-Hydroxy-1,4-naphthoquinone Derivatives
作者:Sadao Tsuboi、Takuzo Komiyama、Yutaka Takaguchi
DOI:10.1055/s-2006-926417
日期:2006.5
In the presence of triethylamine, Diels-Alder reaction, involving decarboxylation-oxidation reaction of 3-hydroxy-2-pyrones with 1,4-benzoquinones gave 5-hydroxy-1,4-naphthoquinone derivatives in excellent to reasonable yields.
Synthesis of Anthraquinone Derivatives: Tandem Diels-Alder-Decarboxylation-Oxidation Reaction of 3-Hydroxy-2-pyrone with 1,4-Naphthoquinone
作者:Sadao Tsuboi、Takuzo Komiyama、Yutaka Takaguchi
DOI:10.1055/s-2005-922769
日期:——
In the presence of triethylamine, the Diels-Alder reaction of 3-hydroxy-2-pyrones with 1,4-naphthoquinones by a decarboxylation-oxidation process gave anthraquinonederivatives in good to excellent yields.
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
Catalytic Asymmetric Desymmetrization of Cyclopentendiones via Diels–Alder Reaction of 3-Hydroxy-2-pyrones: Construction of Multifunctional Bridged Tricyclic Lactones
作者:Li-Min Shi、Wu-Wei Dong、Hai-Yan Tao、Xiu-Qin Dong、Chun-Jiang Wang
DOI:10.1021/acs.orglett.7b02107
日期:2017.9.1
An unprecedented asymmetricDiels–Alderreaction of 3-hydroxy-2-pyrones with prochiral cyclopentene-1,3-diones via desymmetrization was efficiently realized with high stereoselective control with the aid of fine-tunable cinchona alkaloid derived bifunctional amine–thiourea catalysts bearing multiple hydrogen-bonding donors. This protocol provides an expedient access to the multifunctional-bridged tricyclic