Aniline‐Type Hypervalent Iodine(III) for Intramolecular Cyclization via C−H Bond Abstraction of Hydrocarbons Containing N‐ and O‐Nucleophiles
作者:Yuna Nishiguchi、Katsuhiko Moriyama
DOI:10.1002/adsc.202100316
日期:2021.7
We developed a method for the preparation of (diacetoxyiodo)-2-(N-alkylamido)benzene as an aniline-type hypervalent iodine(III). We also achieved direct cyclizations via C−H bond abstraction, such as the Hofmann-Löffler-Freytag reaction, a direct amination, and a direct lactonization, using the aniline-type hypervalent iodine(III) to obtain corresponding products in high yields.
Efficient and Economical Access to Substituted Benzothiazoles: Copper-Catalyzed Coupling of 2-Haloanilides with Metal Sulfides and Subsequent Condensation
Don′t tell azole: The first metal‐catalyzed direct coupling of metalsulfides with aryl halides and subsequent intramolecular condensation provided substitutedbenzothiazoles (see scheme). A wide range of functional groups are tolerated under the reaction conditions.
Magnetic Copper Ferrite Nanoparticles: An Inexpensive, Efficient, Recyclable Catalyst for the Synthesis of Substituted Benzoxazoles via Ullmann-Type Coupling under Ligand-Free Conditions
作者:Hua Wang、Daoshan Yang、Xiao Zhu、Wei Wei、Min Jiang、Ning Zhang、Dandan Ren、Jinmao You
DOI:10.1055/s-0033-1340599
日期:——
A new sustainable strategy for the synthesis of benzoxazoles from substituted N -(2-halophenyl)benzamides was developed in which inexpensive, readily available, air-stable, recyclable copper(II) ferrite serves as a nanocatalyst. The nanocatalyst can be completely recovered with an external magnet and can be used seven times without significant loss of catalytic activity.
开发了一种从取代的 N-(2-卤代苯基)苯甲酰胺合成苯并恶唑的新可持续策略,其中廉价、易得、空气稳定、可回收的铁酸铜 (II) 作为纳米催化剂。纳米催化剂可以通过外部磁铁完全回收,可以使用七次而催化活性没有显着损失。
Synthesis of <i>N</i>-Acylcarbazoles through Palladium-Catalyzed Aryne Annulation of 2-Haloacetanilides
作者:Chun Lu、Nataliya A. Markina、Richard C. Larock
DOI:10.1021/jo3021727
日期:2012.12.21
N-Acylcarbazoles have been synthesized in moderate to good yields by the annulation of in situ generated arynes with 2-haloacetanilides in the presence of a palladium catalyst and CsF. Both C–C and C–N bonds are formed simultaneously, and a variety of functional groups are tolerated in this reaction.
Iodine-Catalyzed, Stereo- and Regioselective Synthesis of 4-Arylidine-4H-benzo[d][1,3]oxazines and their Applications for the Synthesis of Quinazoline 3-Oxides
作者:Wen-Chun Lee、Ho-Chuan Shen、Wan-Ping Hu、Wei-Sheng Lo、Chebrolu Murali、Jaya Kishore Vandavasi、Jeh-Jeng Wang
DOI:10.1002/adsc.201200018
日期:2012.8.13
4-Benzylidene-2-aryl-4H-benzo[d][1,3] oxazines have been synthesized with high stereoselectivity and regioselectivities from 2-alkynylbenzamides in the presence of a catalytic amount of I2. In the reaction mechanism, iodine plays a key role in two different aspects as a catalyst, such as to activate the alkyne with the iodinium donor which triggers the cascade, and then as a proper acid source to facilitate
在催化量的I 2存在下,由2-炔基苯甲酰胺以高的立体选择性和区域选择性合成了4-苄基-2-芳基-4 H-苯并[ d ] [1,3]恶嗪。在反应机理中,碘在两个不同方面起着催化剂的关键作用,例如用引发级联反应的碘供体活化炔烃,然后作为适当的酸源以促进催化剂的回收。苯并恶嗪已经被用作直接一步合成喹唑啉3-氧化物衍生物的潜在底物。