A Short Approach to N-Aryl-1,2,3,4-tetrahydroisoquinolines from N-(2-Bromobenzyl)anilines via a Reductive Amination/Palladium-Catalyzed Ethoxyvinylation/Reductive N-Alkylation Sequence
作者:Franz Bracher、Carina Glas、Ricky Wirawan
DOI:10.1055/s-0040-1706002
日期:2021.6
Starting from readily available ortho-brominated aromatic aldehydes and primary aromatic amines, condensation of these building blocks under reductive conditions gives N-aryl 2-bromobenzylamines. The C-3/C-4-unit of the tetrahydroisoquinoline is introduced using commercially available 2-ethoxyvinyl pinacolboronate under Suzuki conditions. Finally, the obtained crude ortho-ethoxyvinyl benzylamines are cyclized
Bu<sub>4</sub>NI-catalyzed, oxidative C<sub>(sp2)</sub>–C<sub>(sp3)</sub> cross dehydrogenative coupling for the regioselective direct C-3 benzylation of 2<i>H</i>-indazoles
作者:Lalit Yadav、Sandeep Chaudhary
DOI:10.1039/d0ob01282c
日期:——
A Bu4NI-catalyzed, DTBP-promoted, regioselective C(sp2)–C(sp3) cross dehydrogenative coupling (CDC) protocol for the direct C-3 benzylation of 2H-indazoles is reported. The metal-free protocol is operationally simple and proceeds mechanistically via the generation of stable benzylic free-radicals followed by regioselective addition at the C-3 position of 2H-indazoles which afforded C-3 benzylated 2H-indazoles
报道了一种 Bu 4 NI 催化、DTBP 促进的区域选择性 C (sp 2 ) -C (sp 3 )交叉脱氢偶联 (CDC) 方案,用于 2 H-吲唑的直接 C-3 苄基化。无金属方案操作简单,通过产生稳定的苄基自由基,然后在 2 H-吲唑的 C-3 位置进行区域选择性加成,得到 C-3 苄基化的2H-吲唑的产率高达 87%。该方法显示出一系列不同的官能团耐受性和广泛的底物兼容性。克级合成进一步突出了这种方法的重要性和通用性。
Importance of Open Structure of Nonmetal Based Catalyst in Hydrogen Bond Promoted Methanolysis of Activated Amide: Structure Dynamics between Monomer and Dimer Enabling Recombinant Covalent, Dative, and Hydrogen Bonds
作者:Shunsuke Oishi、Junichi Yoshimoto、Susumu Saito
DOI:10.1021/ja9029494
日期:2009.7.1
aminoorganoboron (AOB) compounds that involved a recombinant of covalent, dative, and hydrogen bonds. A combination process occurred via reorganizing elements and bonds between the two major structures (open and closed), which were chemically switchable through precise adjustment of either acidic or basic conditions. The structural dynamics favoring an open structure seem to be more important for catalysis, as represented
A simple and efficient synthesis of isoindolinone derivatives based on reaction of ortho-lithiated aromatic imines with CO
作者:Hai-Jun Li、Yu-Qing Zhang、Liang-Fu Tang
DOI:10.1016/j.tet.2015.07.060
日期:2015.10
A simple and efficient one-pot synthesis of 2,3-disubstituted isoindolinones via the reaction of o-lithiated aromaticimines with carbon monoxide under one atmospheric pressure has been developed. Preliminary in vitro tests for fungicidal activity of these isoindolinone derivatives have been carried out, indicating that most of them exhibit good fungicidal activities.
Manganese(III) Porphyrin‐Catalyzed Dehydrogenation of Alcohols to form Imines, Tertiary Amines and Quinolines
作者:Kobra Azizi、Sedigheh Akrami、Robert Madsen
DOI:10.1002/chem.201900737
日期:2019.5.2
Manganese(III) porphyrin chloride complexes have been developed for the first time as catalysts for the acceptorless dehydrogenative coupling of alcohols and amines. The reaction has been applied to the direct synthesis of imines, tertiary amines and quinolines where only hydrogen gas and/or water are formed as the by‐product(s). The mechanism is believed to involve the formation of a manganese(III) alkoxide