Organocatalytic activation of isocyanides: N-heterocyclic carbene-catalyzed enaminone synthesis from ketones
作者:Jungwon Kim、Soon Hyeok Hong
DOI:10.1039/c6sc05266e
日期:——
suggested a novel role for the carbene in the activation of isocyanides, and a proton transfer process was found to be crucial for the generation of two activated species in the catalytic cycle. Various enaminones, some of which are not easily accessible by other methods, were synthesized in excellent yields. This study clearly demonstrates the potential of the nucleophilic activation of isocyanides in
Dual Activation of Nucleophiles and Electrophiles by N-Heterocyclic Carbene Organocatalysis: Chemoselective N-Imination of Indoles with Isocyanides
作者:Jungwon Kim、Soon Hyeok Hong
DOI:10.1021/acs.orglett.7b01377
日期:2017.6.16
first chemoselective N-imination of indoles with isocyanides by using an N-heterocyclic carbene (NHC) as an organocatalyst was achieved. A concurrent activation of nucleophile (indole) and electrophile (isocyanide) took place facilitated by the novel NHC organocatalysis via initial activation of isocyanide. The in situ generated indole anion and imine-azolium species performed a coupling reaction, producing
The present disclosure provides a redox initiator system for initiating polymerization comprising an oxidizing agent, a photolabile reducing agent derived from a barbiturate, and a transition metal complex that participates in a redox cycle. On exposure to actinic radiation, such as UV, the photolabile compound photolyzes, releasing the reducing agent and initiating the redox-initiated polymerization.
Synthesis of Allyl Cyanamides and <i>N</i>-Cyanoindoles via the Palladium-Catalyzed Three-Component Coupling Reaction
作者:Shin Kamijo、Yoshinori Yamamoto
DOI:10.1021/ja0272742
日期:2002.10.1
The palladium-catalyzedthree-componentcouplingreaction (TCCR) of aryl isocyanides, allyl methyl carbonate, and trimethylsilyl azide was conducted in the presence of Pd(2)(dba)(3).CHCl(3) (2.5 mol %) and dppe (1,2-bis(diphenylphosphino)ethane) (10 mol %). Allyl aryl cyanamides with a wide variety of functional groups were obtained in excellent yields. This palladium-catalyzed TCCR was further utilized
[EN] REDOX POLYMERIZABLE COMPOSITION WITH PHOTOLABILE REDUCING AGENTS<br/>[FR] COMPOSITION POLYMÉRISABLE REDOX AVEC AGENTS RÉDUCTEURS PHOTOLABILES
申请人:3M INNOVATIVE PROPERTIES CO
公开号:WO2017095704A1
公开(公告)日:2017-06-08
Polymerizable compositions comprising a redox initiator system is disclosed. The redox initiators comprises a photolabile reducing agent, that photolyzes and initiates the redox cycle. Dental compositions comprising dental resins and the photolabile redox initiator system are also described.