Efficient Assembly of Polysubstituted Pyrroles via a (3 + 2) Cycloaddition/Skeletal Rearrangement/Redox Isomerization Cascade Reaction
作者:Yuanyuan Yu、Chunyu Wang、Xinze He、Xiaotong Yao、Liansuo Zu
DOI:10.1021/ol501580b
日期:2014.7.3
redox isomerization, for the synthesis of 3-allyl pyrroles is reported. In a single step, readily accessible simple starting materials are transformed into highly substituted pyrroles with high efficiency. The products obtained contain allyl substituents, which can be readily elaborated to other useful functional groups. The reaction proceeds through an unusual (3 + 2) cycloaddition/skeletal rearrangement/redox
Organocatalytic Enantioselective Cross-Vinylogous Rauhut-Currier Reaction of Methyl Coumalate with Enals
作者:Qiwen Liu、Liansuo Zu
DOI:10.1002/anie.201805019
日期:2018.7.20
The organocatalytic enantioselective intermolecular cross‐vinylogous Rauhut–Currier (RC) reaction of methyl coumalate with α,β‐unsaturated aldehydes is reported, and the enals are activated by iminium catalysis to serve as the Michael acceptors and methyl coumalate is used as an activated diene to generate a latent enolate. The excellent selectivity is driven by the aromaticity of methyl coumalate
In contrast to well‐established asymmetric hydrogenation reactions, enantioselective protonation is an orthogonal approach for creating highly valuable methine chiral centers under redox‐neutral conditions. Reported here is the highly enantio‐ and diastereoselective hydrofluorination of enals by an asymmetric β‐protonation/α‐fluorination cascade catalyzed by N‐heterocyclic carbenes (NHCs). The two
Organocatalytic Hantzsch Type Reaction Using Aryl Hydrazines, Propiolic Acid Esters and Enals: Enantioselective Synthesis of Paroxetine
作者:Lu Chen、Zhi Zhang、Liansuo Zu
DOI:10.1002/adsc.202000779
日期:2020.12.8
Aryl hydrazines, propiolic acid esters and enals serve as a viable substrate combination for an organocatalytic enantioselective Hantzsch type reaction. The method converts readily available starting materials into important chiral heterocycles with good to excellent yields and enantioselectivities, and has addressed the longstanding scope limitation of the classic Hantzsch reaction in the asymmetric
Chemoselective N-Heterocyclic Carbene-Catalyzed Cascade of Enals with Nitroalkenes
作者:Zijun Wu、Xu Wang、Fangyi Li、Jicheng Wu、Jian Wang
DOI:10.1021/acs.orglett.5b01692
日期:2015.7.17
An unprecedented N-heterocycliccarbenecatalyzed chemoselective and enantioselective cascade reaction of enals with nitroalkenes has been developed. A wide range of enantioenriched dihydrocoumarins has been prepared, and the reaction goes through an enolate intermediate generated under a catalytic process.