Cobalt-Catalyzed Selective Synthesis of Isoquinolines Using Picolinamide as a Traceless Directing Group
作者:Changsheng Kuai、Lianhui Wang、Bobin Li、Zhenhui Yang、Xiuling Cui
DOI:10.1021/acs.orglett.7b00702
日期:2017.4.21
first been employed as a traceless directing group for the cobalt-catalyzed oxidative annulation of benzylamides with alkynes to synthesize isoquinolines throughC–H/N–H bonds activation. Oxygen is used as a terminal oxidant. This protocol exhibits good functional group tolerance and excellent regioselectivity. Both terminal and internalalkynes can be efficiently applied to this catalytic system as substrates
Palladium‐Catalyzed Picolinamide‐Directed Acetoxylation of Unactivated γ‐C(
<i>sp</i>
<sup>3</sup>
)H Bonds of Alkylamines
作者:Qiong Li、Shu‐Yu Zhang、Gang He、William A. Nack、Gong Chen
DOI:10.1002/adsc.201400121
日期:2014.5.5
protocol for palladium‐catalyzedacetoxylation of the γ‐C(sp3)Hbonds of N‐alkylpicolinamide substrates using PhI(OAc)2 oxidant. These reactions involve the use of substoichiometric amounts of Li2CO3 additive, which effectively suppresses the competing intramolecular CH amination process. Under these conditions, N‐propylpicolinamides bearing α substituents can be cleanly converted to γ‐acetoxylated
我们报告的γ-C(钯催化的乙酰氧基化的新协议SP 3) H的键Ñ使用Φ-alkylpicolinamide基板(OAC)2氧化剂。这些反应涉及使用亚化学计量的Li 2 CO 3添加剂,该添加剂可有效抑制竞争的分子内CH胺化过程。在这些条件下,带有α取代基的N-丙基吡啶甲酰胺可以优良的收率干净地转化为γ-乙酰氧基化胺产物。这种CH乙酰氧基化反应也可以与其他Pd催化的吡啶甲酰胺定向C一起使用H功能化反应可快速实现支架的多样化。
Cobalt-Catalyzed<i>ortho</i>-C−H Functionalization/Alkyne Annulation of Benzylamine Derivatives: Access to Dihydroisoquinolines
作者:Ángel Manu Martínez、Nuria Rodríguez、Ramón Gómez-Arrayás、Juan C. Carretero
DOI:10.1002/chem.201702283
日期:2017.8.25
A practical picolinamide-directed C−H functionalization/alkyne annulation of benzylaminederivatives enabling access to the previously elusive 1,4-dihydroisoquinoline skeleton was developed using molecular O2 as the sole oxidant and Co(OAc)2 as precatalyst. The method is compatible with both internal and terminal alkynes and shows high versatility and functional-group tolerance. Furthermore, full preservation
Herein, we disclose a recyclable, hybrid manganese catalyst for site-selective azine C−H activation by weak amide assistance. The novel, reusablecatalyst enabled C3–H arylation and C3–H alkylation with ample scope, and was characterized by detailed transmission electron microscopy analysis.
Manganaelectro-Catalyzed Azine C–H Arylations and C–H Alkylations by Assistance of Weakly Coordinating Amides
作者:Leonardo Massignan、Cuiju Zhu、Xiaoyan Hou、João C. A. Oliveira、Aude Salamé、Lutz Ackermann
DOI:10.1021/acscatal.1c02516
日期:2021.9.17
Oxidative C–H functionalization has faced considerable limitations by the need for stoichiometric amounts of chemical oxidants. In sharp contrast, we herein present the merger of electrosynthesis with non-toxic manganese catalysis for oxidative C–H arylations and C–H alkylations with electricity as the terminal oxidant. Mechanistic experimental studies as well as cyclic voltammetry and scanning electron