Carbonylative Formal Cycloaddition between Alkylarenes and Aldimines Enabled by Palladium-Catalyzed Double C–H Bond Activation
作者:Yongzheng Ding、Jianing Wu、Hanmin Huang
DOI:10.1021/jacs.3c00004
日期:2023.3.8
Double C–Hbondactivation can enable an expeditious reaction pathway to cyclic compounds, offering an efficient tool to synthesize valuable molecules. However, cyclization reaction enabled by double C–Hbondactivation at one carbon atom is nearly unknown. Herein, we report a carbonylative formal cycloaddition of alkylarenes with imines via double benzylic C–Hbondactivation at one carbon atom, allowing
Graphite-Supported Gold Nanoparticles as Efficient Catalyst for Aerobic Oxidation of Benzylic Amines to Imines and<i>N</i>-Substituted 1,2,3,4-Tetrahydroisoquinolines to Amides: Synthetic Applications and Mechanistic Study
作者:Man-Ho So、Yungen Liu、Chi-Ming Ho、Chi-Ming Che
DOI:10.1002/asia.200900261
日期:2009.10.5
of N‐substituted 1,2,3,4‐tetrahydroisoquinolines in the presence of aqueous NaHCO3 solution gave the corresponding amides in good yields (83–93 %) with high selectivity (up to amide/enamide=93:4) (6 examples). The same protocol can be applied to the synthesis of benzimidazoles from the reaction of o‐phenylenediamines with benzaldehydes under aerobic conditions (8 examples). By simple centrifugation
使用氧气作为末端氧化剂对胺进行选择性氧化是绿色化学中的重要领域。在这项工作中,我们描述了使用石墨负载的金纳米颗粒(AuNPs / C)催化环状和非环状苄胺的好氧氧化为相应的亚胺,具有中等至优异的底物转化率(43-100%)和产品收率(66–99%)(19个例子)。在NaHCO 3水溶液存在下,对N-取代的1,2,3,4-四氢异喹啉进行氧化,得到的酰胺产率高(83-93%),选择性高(酰胺/酰胺= 93:4)( 6个示例)。相同的协议可以从反应被施加到苯并咪唑的合成Ò在好氧条件下将苯二胺与苯甲醛一起使用(8个例子)。通过简单的离心,可以回收AuNPs / C并重复使用十次,以将二苄基胺氧化为N-亚苄基(苯基)甲胺,而不会显着降低催化活性和选择性。可以将协议“ AuNPs / C + O 2 ”调整为克级,通过氧化10 g 1,2,3,4-可以得到8.9 g(84%分离出的产率)3,4-二氢异
Reduction with organic selenium compounds II. Reduction of Schiff bases with selenophenol reductive alkylation of amines with carbonyl compounds
作者:Ken Fujimori、Hiroshi Yoshimoto、Shigeru Oae
DOI:10.1016/s0040-4039(00)78695-3
日期:1980.1
Reduction of Schiffbases with selenophenol proceeded at room temperature to yield the corresponding sec. amines quantitatively. The reaction of either prim. amine or sec. amine with carbonyl compound and selenophenol gave sec. or tert. amines, respectively. Different alkyl groups can be introduced successively on nitrogen of prim. amines to afford tert. amines bearing three different alkyl groups