Conjugate Addition–Enantioselective Protonation of <i>N</i>-Aryl Glycines to α-Branched 2-Vinylazaarenes via Cooperative Photoredox and Asymmetric Catalysis
and a dicyanopyrazine-derived chromophore (DPZ) photosensitizer that is mediated by visible light, a variety of α-branched 2-vinylpyridines and 2-vinylquinolines with N-aryl glycines underwent a redox-neutral, radical conjugate addition-protonation process and provided valuable chiral 3-(2-pyridine/quinoline)-3-substituted amines in high yields with good to excellent enantioselectivities (up to >99%
Copper-Catalyzed C–H Stereoselective Cyanation of Alkenes by Using an α-Iminonitrile as a Cyanating Reagent
作者:Yong-Ming Zhu、Zhen-Bang Chen、Qing-Qing Gao、Kui Liu
DOI:10.1055/s-0037-1610680
日期:2019.1
Abstract The first copper-catalyzed cyanation through alkene C–H bond activation by using an α-iminonitrile as a cyanating agent has been realized. The approach efficiently constructs acrylonitriles in good yields with the advantages of high regioselectivity, cost-benefit, and operational simplicity. The first copper-catalyzed cyanation through alkene C–H bond activation by using an α-iminonitrile
A protocol for the synthesis of α-tertiary amines was developed by iterative addition of carbon nucleophiles to N,N-dialkyl carboxamides. Nucleophilic 1,2-addition of organolithium reagents to carboxamides forms anionic tetrahedral carbinolamine (hemiaminal) intermediates, which are subsequently treated with bromotrimethylsilane (Me3SiBr) followed by organomagnesium (Grignard) reagents, organolithium
Organic light emitting diode containing a novel Ir complex as a phosphorescent emitter
申请人:Cheng Chien-Hong
公开号:US20050227109A1
公开(公告)日:2005-10-13
A phosphorescent Ir complex having the following structures (I) or (II) is used as an emitter in an organic light emitting diode (OLED):
wherein X is an arbitrary monoanionic bidentate ligand; Z is an arbitrary moiety constituting a nitrogen-containing heterocyclic group; R
1
is a substituent on the nitrogen-containing heterocyclic group; m is 0 or a positive integer; R
2
and R
3
independently are H, halogen, C1-C6 alkyl, a halogen-substituted C1-C6 alkyl, C1-C6 alkoxy, phenyl C1-C6 alkyl, amino, aryl, heterocyclic aryl substituent.