Organocatalytic Access to Enantioenriched Dihydropyran Phosphonates via an Inverse-Electron-Demand Hetero-Diels–Alder Reaction
作者:Christian F. Weise、Vibeke H. Lauridsen、Raoní S. Rambo、Eva H. Iversen、Marie-Luise Olsen、Karl Anker Jørgensen
DOI:10.1021/jo500347a
日期:2014.4.18
hetero-Diels–Alder reaction of the remote olefin functionality in dienamines has been developed by the simultaneous activation of α,β-unsaturated aldehydes and acyl phosphonates. The dual activation is based on an organocatalyst that activates both the α,β-unsaturated aldehyde, through dienamine formation, and the acyl phosphonate by hydrogen-bonding. The enantioselective reaction results in the formation
作者:Łukasz Albrecht、Gustav Dickmeiss、Fabio Cruz Acosta、Carles Rodríguez-Escrich、Rebecca L. Davis、Karl Anker Jørgensen
DOI:10.1021/ja211878x
日期:2012.2.8
concept in organocatalysis allowing for the construction of cyclobutanes with four contiguous stereocenters with complete diastereo- and enantiomeric control by a formal [2 + 2]-cycloaddition is presented. The concept is based on simultaneous dual activation of α,β-unsaturated aldehydes and nitroolefins by amino- and hydrogen-bonding catalysis, respectively. A new bifunctional squaramide-based aminocatalyst
Dienamine-Mediated Inverse-Electron-Demand Hetero-Diels-Alder Reaction by Using an Enantioselective H-Bond-Directing Strategy
作者:Łukasz Albrecht、Gustav Dickmeiss、Christian F. Weise、Carles Rodríguez-Escrich、Karl Anker Jørgensen
DOI:10.1002/anie.201207122
日期:2012.12.21
Giving directions: optically active dihydropyrans bearing three contiguous stereogenic centers can be efficiently prepared by the title reaction. High stereo- and regiocontrol can be achieved by employing a bifunctional H-bond-directing aminocatalyst.
Organocatalytic Asymmetric Multicomponent Cascade Reaction for the Synthesis of Contiguously Substituted Tetrahydronaphthols
作者:Yidong Liu、Joseph A. Izzo、David McLeod、Sebastijan Ričko、Esben B. Svenningsen、Thomas B. Poulsen、Karl Anker Jørgensen
DOI:10.1021/jacs.1c03923
日期:2021.6.2
unique, highly reactive, aromatic intermediates which are largely unexplored in asymmetric catalysis despite their high potential synthetic utility. In this study, an organocatalytic asymmetric multicomponent cascade via dienamine catalysis, involving a cycloaddition, a nucleophilic addition, and a ring-opening reaction, is disclosed. The reaction furnishes chiral tetrahydronaphthols containingfour contiguous