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。
Synthesis of Benzyl Esters via Functionalization of Multiple C–H Bonds by Palladium Catalysis
A highly efficient, selective synthesis of benzyl esters by palladium catalysis is developed through the bidentate directing group assisted functionalization of multiple C(sp3)–H bonds.
Palladium-Catalyzed Regioselective Insertion of Carbenes into γ-C(sp<sup>3</sup>)–H Bonds of Aliphatic Amines
作者:Peng Zhang、Cheng-xin Li、ShihaoZhi Wang、Xue-jing Zhang、Ming Yan
DOI:10.1021/acs.orglett.4c00038
日期:2024.4.5
migratory insertion of carbenes into distal γ-C(sp3)–H bonds of aliphatic amines has been successfully developed. The synergistic interplay among a palladium catalyst, picolinamide directing group, a carefully selected base additive, and an essential ligand proved crucial in achieving high yields. These findings hold significant value for advancing the exploration of regioselective carbeneinsertions into
Copper-Catalyzed Carboxamide-Directed <i>Ortho</i> Amination of Anilines with Alkylamines at Room Temperature
作者:Qiong Li、Shu-Yu Zhang、Gang He、Zhaoyan Ai、William A. Nack、Gong Chen
DOI:10.1021/ol500464x
日期:2014.3.21
In this report, a highly efficient method for the room temperature installation of alkyl amino motifs onto the ortho position of anilines via Cu-catalyzed carboxamide-directed amination with alkylamines is described. This method offers a practical solution for the rapid synthesis of complex arylamines from simple starting materials and enables new planning strategies for the construction of arylamine-containing pharmacophores. A single electron transfer (SET)-mediated mechanism is proposed.
Directed C–H Functionalization Reactions with a Picolinamide Directing Group: Ni-Catalyzed Cleavage and Byproduct Recycling
作者:Sovan Biswas、Narendraprasad Reddy Bheemireddy、Mathias Bal、Ben F. Van Steijvoort、Bert U. W. Maes
DOI:10.1021/acs.joc.9b02299
日期:2019.10.18
first Boc activated into tertiary N-Boc-N-substituted picolinamides. These were then cleaved via a Ni-catalyzed esterification reaction with EtOH to give valuable N-Boc protected amines. Ni(cod)2 was used as a catalyst without any ligands or base additives. The byproduct, ethyl 2-picolinate can be used to install the picolinamide DG in a direct or indirect manner on amines. The protocol exhibits a