Microwave Irradiation–Assisted Amination of 2-Chloropyridine Derivatives with Amide Solvents
摘要:
A simple, quick, and high-yielding microwave-assisted synthesis of 2-(N,N-dimethyl)amine- and 2-aminopyridine derivatives is reported here for the first time in the reaction of 2-chloro substituted pyridines with amide solvents such as dimethylformamide or formamide, without transition-metal catalysts.
Scope and Facial Selectivity of the Prins-Pinacol Synthesis of Attached Rings
摘要:
[GRAPHICS]Using a B-alkyl Suzuki cross-coupling as a key step, a concise and stereocontrolled synthesis of five- to eight-membered triisopropylsiloxy ethers having (2Z)-(6,6-dimethoxyhexylidene) or (2Z)-(5,5-dimethoxypentylidene) side chains was developed. Prins-pinacol reactions of these precursors promoted by SnCl4 provide bicyclic products in which 5-, 6-, or 7-membered rings are joined by a C-C single bond. Synthetically challenging attached ring systems in which both rings are chiral can be prepared in this fashion with high stereo- and enantioselectivity. Stabilizing through-space electrostatic interactions between the alpha-alkoxycarbenium ion and an axially positioned oxygen substituent are believed to play a significant role in organizing the transition structure of the Prins cyclization.
A practical synthesis of substituted 2,6-diaminopyridines via microwave-assisted copper-catalyzed amination of halopyridines
作者:Matthias Mastalir、Egon E. Rosenberg、Karl Kirchner
DOI:10.1016/j.tet.2015.08.042
日期:2015.10
selective substitution of one or two halogens by aryl or alkylamines was achieved within 2–6 h with temperatures between 80 and 225 °C affording 2,6-diaminopyridines in good to excellent isolated yields. The reaction allows easy variation between educts and different N-substitutions. The target compounds are valuable precursors for the synthesis of bis-phosphorylated 2,6-diaminopyridines which are
PHOSPHORESCENT SUBSTANCE AND PHOSPHORESCENT ELEMENT
申请人:Kyushu University,
National University Corporation
公开号:EP3553151A1
公开(公告)日:2019-10-16
The invention discloses a long persistent luminescence emitter which has an electron-donating molecule that is stable in the radical cation state and an electron-accepting molecule that is stable in the radical anion state and from which luminescence is observed at 10 K after photo-irradiation of the long persistent luminescence emitter stops. According to the disclosed invention, persistent luminescence can be exhibited for a long time with only organic compounds without the use of any rare-earth elements.
本发明公开了一种长持续发光发射体,该发射体具有在自由基阳离子状态下稳定的供电子分子和在自由基阴离子状态下稳定的受电子分子,在停止对长持续发光发射体进行光照射后,可在 10 K 温度下观察到该发射体发光。根据本发明,只需使用有机化合物,而无需使用任何稀土元素,就能长时间发出持久性发光。
Nitrile-stabilized carbanions. Nucleophilic substitution reactions on bromopyridines
作者:George R. Newkome、Young J. Joo、David W. Evans、Sebastiano Pappalardo、Frank R. Fronczek