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
Copper-Catalyzed Cascade Reaction via Intramolecular Hydroamination Cyclization of Homopropargylic Amines and Intermolecular Povarov Reaction with Imines
作者:Hongkai Wang、Chan Wang、Kaimeng Huang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1021/acs.orglett.6b00804
日期:2016.5.20
cascade reaction of homopropargylic amines with simple imines is developed in the presence of Cu(OTf)2 and affords a series of hexahydro-1H-pyrrolo[3,2-c]quinoline derivatives in good to high yields. This reaction proceeds through an intramolecular hydroamination cyclization of homopropargylic amine to generate a highly reactive dihydropyrrole intermediate in situ. It subsequently reacts with imine via
在Cu(OTf)2存在下,开发了一种新的单炔胺与单亚丙基胺的级联反应,该反应可提供高产率或高产率的一系列六氢-1 H-吡咯并[3,2- c ]喹啉衍生物。该反应通过均炔丙基胺的分子内加氢胺化环化进行,以原位产生高反应性的二氢吡咯中间体。随后,它通过分子间反电子需求的aza-Diels-Alder反应和1,3-H移位与亚胺反应,形成稠合的吡咯并喹啉结构,形成两个新的C-C键,一个C-N键和一个N –H键。
Ir-Catalyzed C−H Amidation of Aldehydes with Stoichiometric/Catalytic Directing Group
作者:Yun-Fei Zhang、Bin Wu、Zhang-Jie Shi
DOI:10.1002/chem.201603805
日期:2016.12.5
Ir‐catalyzed sp2 C−Hamidation of aldehydes with various anilines as stoichiometric or catalytic directing groups was accomplished. A wide range of substrates were selectively amidated in good to excellent yields with broad functional group tolerance. The iridacycle complexes were isolated, characterized, and proved as key intermediates. Kinetic studies and Hammett plots provided detailed understandings
用各种苯胺作为化学计量或催化方向的基团,对醛进行了Ir催化的sp 2 CH酰胺化反应。以良好的产率和优异的产率选择性选择性地酰胺化各种底物,并具有宽泛的官能团耐受性。分离,表征并证明了iridacycle复合物是关键中间体。动力学研究和Hammett图提供了对这种酰胺化反应的详细了解。根据机理,证明了富电子的ArSO 2 N 3对于分子间sp 3 CH酰胺化有效。
Photoredox Radical/Polar Crossover Enables Construction of Saturated Nitrogen Heterocycles
作者:Loïc R. E. Pantaine、John A. Milligan、Jennifer K. Matsui、Christopher B. Kelly、Gary A. Molander
DOI:10.1021/acs.orglett.9b00602
日期:2019.4.5
Photoredox-mediated radical/polar crossover (RPC) processes offer new avenues for the synthesis of cyclic molecules. This process has been realized for the construction of medium-sized saturated nitrogen heterocycles. Photocatalytically generated alkylradicals possessing pendant leaving groups engage imines in C–C bond formation, and subsequent reduction of the intermediate nitrogen-centered radical triggers
The various imines were prepared from alcohols and amines in moderate to good yields under an air atmosphere promoted by KOH, eliminating the need for toxic transition metal catalysts. Due to its simplicity, this protocol will have wide application in synthesis.