Selective Oxidative [4+2] Imine/Alkene Annulation with H<sub>2</sub>
Liberation Induced by Photo-Oxidation
作者:Xia Hu、Guoting Zhang、Faxiang Bu、Aiwen Lei
DOI:10.1002/anie.201711359
日期:2018.1.26
The oxidative [4+2] annulationreaction represents an elegant and versatile syntheticprotocol for the construction of six‐membered heterocyclic compounds. Herein, a photoinduced oxidative [4+2] annulation of NH imines and alkenes was developed by utilizing a dual photoredox/cobaloxime catalytic system. Various multisubstituted 3,4‐dihydroisoquinolines can be obtained in good yields. This method is
N−H Imine as a Powerful Directing Group for Cobalt‐Catalyzed Olefin Hydroarylation
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/anie.201605877
日期:2016.10.4
N‐alkyl and N‐aryl imineshave been frequently used as directing groups in rhodium‐ and cobalt‐catalyzed hydroarylation reactions of olefins and alkynes. However, the scope of such hydroarylation reactions has been limited by the difficulty of preparation of sterically hindered imines by condensation, and also by the steric bulkiness of the iminegroup itself. Reported herein is that an N−H imine serves
The present invention provides a polymerizable compound having high storage stability without causing crystal precipitation when added to a polymerizable composition. The present invention also provides a polymerizable composition containing the compound. When the filmy polymer produced through polymerization of the polymerizable composition is irradiated with UV light, it hardly discolors or peels from substrate. Further, the present invention provides a polymer produced through polymerization of the polymerizable composition and an optically anisotropic body using the polymer.
Electrocarboxylation of <i>N</i>-Acylimines with Carbon Dioxide: Access to Substituted α-Amino Acids
作者:Ke Zhang、Xiao-Fei Liu、Wen-Zhen Zhang、Wei-Min Ren、Xiao-Bing Lu
DOI:10.1021/acs.orglett.2c01267
日期:2022.5.20
Direct electrocarboxylation of various N-acylimines with atmospheric CO2 is achieved in an undivided cell under mild conditions, affording substituted α-amino acids in yields of 62–95%. This reaction is conducted with high efficiency using triethanolamine as an external reductant under nonsacrificial anode conditions, and can be facilely performed on gram scale. Preliminary mechanistic studies including
各种N-酰基亚胺与大气 CO 2的直接电羧化是在温和条件下在未分裂的电池中实现的,以 62-95% 的产率提供取代的 α-氨基酸。该反应在非牺牲阳极条件下使用三乙醇胺作为外部还原剂高效进行,并且可以轻松地以克级进行。包括循环伏安法和对照实验在内的初步机理研究支持N自由基碳负离子作为关键中间体。
Direct Regioselective Reductive Allylation of Imines: Application to Synthesis of Oxazines with Halogenated Reagent
作者:Tao Ju、Ai-Ling Lu、Yu-Chao Zhou、Min Ge、Jing Sun、Ying Han、Chao-Guo Yan
DOI:10.1021/acs.orglett.3c03407
日期:2023.12.15
Oxazines are an important class of compounds in oxazine ligands and medical chemistry. Here, we describe a linear-selective allylation of imines with allyl electrophiles via cross-electrophile coupling reactions, followed by cyclization with halogenated reagents, providing a new strategy to afford oxazine compounds with a tetrasubstituted carbon center. Mechanistic studies indicate that α-amino carbanion