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。
Highly Efficient Syntheses of Azetidines, Pyrrolidines, and Indolines via Palladium Catalyzed Intramolecular Amination of C(sp<sup>3</sup>)–H and C(sp<sup>2</sup>)–H Bonds at γ and δ Positions
palladium-catalyzed intramolecular amination of C-H bonds at the γ and δ positions of picolinamide (PA) protected amine substrates. These methods feature relatively a low catalyst loading, use of inexpensive reagents, and convenient operating conditions. Their selectivities are predictable. These methods highlight the use of unactivated C-H bond, especially the C(sp(3))-H bond of methyl groups, as functional