TMEDA-Assisted Effective Direct Ortho Arylation of Electron-Deficient <i>N</i>-Heteroarenes with Aromatic Grignard Reagents
作者:Fang-Fang Zhuo、Wen-Wen Xie、Yong-Xin Yang、Lei Zhang、Pei Wang、Rui Yuan、Chao-Shan Da
DOI:10.1021/jo400152f
日期:2013.4.5
the addition of TMEDA in toluene, aryl Grignards could effectively and site-specifically ortho-arylate electron-deficient heteroarenes under mild conditions. This endeavor successfully changed the old low-yielding reaction, aryl Grignard addition to N-heteroarenes, into an efficient procedure for heterobiaryls. The combination of the inexpensive aryl Grignards, TMEDA, the cost-free air, no use of any
three-dimensional molecular architectures from planar aromatics such as quinolines is of great interest and importance from the viewpoint of both organic synthesis and drug discovery, but there still exist many challenges. Here, we report the scandium-catalyzed asymmetric dearomative spiro-annulation of quinolines with alkynes. This protocol offers an efficient and selective route for the synthesis of spiro-dihydroquinoline
A Method for the Synthesis of Substituted Quinolines via Electrophilic Cyclization of 1-Azido-2-(2-propynyl)benzene
作者:Zhibao Huo、Ilya D. Gridnev、Yoshinori Yamamoto
DOI:10.1021/jo902603v
日期:2010.2.19
A new and efficient strategy for the synthesis of substituted quinolines viaelectrophilic cyclization is developed. The intramolecular cyclization of 1-azido-2-(2-propynyl)benzene 1 proceeds smoothly in the presence of electrophilic reagents (I2, Br2, ICl, NBS, NIS, and HNTf2) in CH3NO2 at room temperature or in the presence of catalytic amounts of AuCl3/AgNTf2 in THF at 100 °C to afford the corresponding
Synthesis of Benzoacridines and Benzophenanthridines by Regioselective Pd-Catalyzed Cross-Coupling Reactions Followed by Acid-Mediated Cycloisomerizations
Various benzoacridines and benzophenanthridines have been synthesized by Brønsted acid mediated cycloisomerisation as the key step. The optical and electrochemical properties have been studied by UV/Vis and emission spectroscopy as well as CV measurements. Obtained results have been verified by DFT calculations.