Chiral Triazoles in Anion-Binding Catalysis: New Entry to Enantioselective Reissert-Type Reactions
作者:Mercedes Zurro、Sören Asmus、Julia Bamberger、Stephan Beckendorf、Olga García Mancheño
DOI:10.1002/chem.201504094
日期:2016.3.7
Easily accessible and tunable chiral triazoles have been introduced as a novel class of C−Hbond‐based H‐donors for anion‐binding organocatalysis. They have proven to be effective catalysts for the dearomatization reaction of different N‐heteroarenes. Although this dearomatization approach represents a powerful strategy to build chiral heterocycles, to date only a few catalytic methods to this end
Ruthenium-Mediated Dual Catalytic Reactions of Isoquinoline <i>via</i>
C−H Activation and Dearomatization for Isoquinolone
作者:Ting-Hsuan Wang、Wei-Chih Lee、Tiow-Gan Ong
DOI:10.1002/adsc.201600313
日期:2016.9.1
We have unraveled the ruthenium‐promoted prototype reaction based on C(sp2)−C(sp3) bond formation through the reigoselective C−Hactivation of isoquinoline and pyridine derivatives with various alkyl halides, leading to 1‐substituted isoquinoline products in good yield. This C−H catalytic reaction did not rely on chelation assistance of the directing group of the substrates. The dimer [RuCl2(p‐cymene)]2
我们已经解开了钌促进的基于C(sp 2)-C(sp 3)键形成的原型反应,该反应是通过对异喹啉和吡啶衍生物与各种卤代烷进行区域选择性C H活化而形成的,从而得到了1取代的异喹啉产品屈服。该CH催化反应不依赖于底物的导向基团的螯合辅助。二聚体[RuCl 2(p- cymene)] 2与N-杂环卡宾配体,金刚烷羧酸和K 2 CO 3碱在N中的结合最佳的条件是在150°C下使用2-甲基-2-吡咯烷酮溶液。同时,我们还能够通过添加水来化学调节反应模式以脱芳香化,从而制得异喹诺酮产品。该反应方法不适用于其他含氮杂芳烃,如哒嗪和嘧啶。
1,3,5-TRIAZINE DERIVATIVE, PROCESS FOR PRODUCING SAME, AND ORGANIC ELECTROLUMINESCENT ELEMENT COMPRISING SAME AS CONSTITUENT COMPONENT
申请人:Aihara Hidenori
公开号:US20110190494A1
公开(公告)日:2011-08-04
A 1,3,5-triazine derivative represented by the formula (1):
wherein R
1
, R
2
and R
3
each independently represent a hydrogen atom or a methyl group; X represents a carbon atom or a nitrogen atom; Ar
1
represents a substituted or unsubstituted aromatic hydrocarbon group; Ar
2
represents an C
1-4
alkyl-substituted or unsubstituted aromatic 6-membered heterocyclic group having one or two nitrogen atoms, which may be a condensed ring compound. An organic electroluminescent device comprising the 1,3,5-triazine derivative exhibits low power consumption and long lifetime.
A straightforward photocatalytic approach has been demonstrated to incorporate a trifluoroethanol unit onto the isoquinolines. Herein, we report N-trifluoroethoxyphthalimide as a hydroxyfluoroalkyl radical precursor, enabling efficient synthesis of trifluoroethanol-substituted heteroarenes. Radical quenching experiments confirmed the involvement of a free-radical pathway under developed photocatalytic