Facile access to highly functionalized hydroisoquinoline derivatives<i>via</i>phosphine-catalyzed sequential [3+3]/[3+3] annulation
作者:Ning Li、Penghao Jia、You Huang
DOI:10.1039/c9cc05832j
日期:——
An unprecedented sequential [3+3]/[3+3] annulation of allenoates and dienes catalyzed by phosphine has been developed, which provides novel and facile access to highly functionalized hydroisoquinoline derivatives. The reaction features a wide reaction scope and mild reaction conditions. δ-sulfonamido-allenoates, acting as a five-atom unit, represent a new synthon in the reactions of allenoates.
Unusual Formal [1+4] Annulation through Tandem P(NMe<sub>2</sub>
)<sub>3</sub>
-Mediated Cyclopropanation/Base-Catalyzed Cyclopropane Rearrangement: Facile Syntheses of Cyclopentenimines and Cyclopentenones
作者:Rong Zhou、Kai Zhang、Ling Han、Yusong Chen、Ruifeng Li、Zhengjie He
DOI:10.1002/chem.201505047
日期:2016.4.18
An unusual formal [1+4] annulation of α‐dicarbonyl compounds with 1,1‐dicyano‐1,3‐dienes has been realized, leading to facile syntheses of cyclopentenimines and cyclopentenones in a unique manner. Mechanistic investigation implies that this reaction takes place through a P(NMe2)3‐mediated cyclopropanation followed by a base‐catalyzed cyclopropane rearrangement. It therefore represents an unprecedented
A Concise Assembly of Electron-Deficient 2,4-Dienes and 2,4-Dienals: Regio- and Stereoselective<i>exo</i>-Diels-Alder and Redox Reactions through Sequential Amine and Carbene Catalysis
catalysis: A γ,δ‐regioselective anomalous exo‐Diels–Alder reaction with electron‐deficient β‐substituted 2,4‐dienes and 2,4‐dienals has been developed by using trienamine activation. The resulting multifunctional cycloadducts contain perfectly positioned functional groups, thereby facilitating a 1,5‐hydride transfer from the C–H group of an aldehyde to an activated alkene under sequential catalysis of
Chiral phosphine-catalyzed asymmetric [4 + 1] annulation of polar dienes with allylic derivatives: Enantioselective synthesis of substituted cyclopentenes
作者:Hanyuan Li、Zhengjie He
DOI:10.1016/j.tetlet.2021.152863
日期:2021.3
A chiral phosphine-catalyzedasymmetric [4 + 1] annulation reaction of polar 1,3-dienes and allylic derivatives is reported. Under the catalysis of P-chiral bicyclic phosphine (15 mol%), a series of 1,1-dicyano-2,4-diaryl-1,3-dienes (21 examples) readily undergo stereoselective [4 + 1] annulation reactions with allylic acetate under mild conditions, delivering enantio-enriched polysubstituted cyclopentenes
Highly Substituted Cyclohexenes via Phosphine-Catalyzed [4+2] Annulation of Electron-deficient Dienes and Vinyl Ketones
作者:Peng Chen、Junyou Zhang、Junliang Zhang
DOI:10.1002/adsc.201701168
日期:2018.2.15
A highly efficient phosphine‐catalyzed [4+2] annulation of electron‐deficient diene and alkyl vinyl ketone was developed for the first time, which provides an easy access to functionalized cyclohexenes. This method has the advantages of mild reaction conditions, widely functional group tolerance, high yields and transition metal free.