A Unified Approach to Couple Aromatic Heteronucleophiles to Azines and Pharmaceuticals
作者:Ryan G. Anderson、Brianna M. Jett、Andrew McNally
DOI:10.1002/anie.201807322
日期:2018.9.17
Coupling aromatic heteronucleophiles to arenes is a common way to assemble drug‐like molecules. Many methods operate via nucleophiles intercepting organometallic intermediates, via Pd‐, Cu‐, and Ni‐catalysis, that facilitate carbon‐heteroatom bond formation and a variety of protocols. We present an alternative, unified strategy where phosphonium salts can replicate the behavior of organometallic intermediates
将芳香族异核试剂与芳烃偶联是组装类药物分子的常见方法。许多方法通过亲核试剂拦截有机金属中间体,通过 Pd、Cu 和 Ni 催化来进行,从而促进碳杂原子键的形成和各种方案。我们提出了一种替代的、统一的策略,其中鏻盐可以复制有机金属中间体的行为。在一组狭窄的反应条件下,多种芳香族杂核亲核试剂可以与吡啶和二嗪偶联,这在金属催化偶联中经常出现问题,例如在具有多个极性官能团的复杂结构中无法获得(假)卤化物前体。
Mechanistic Approach Toward the C4‐Selective Amination of Pyridines via Nucleophilic Substitution of Hydrogen
作者:Hoonchul Choi、Won Seok Ham、Pit van Bonn、Jianbo Zhang、Dongwook Kim、Sukbok Chang
DOI:10.1002/anie.202401388
日期:2024.6.10
Tailored pyridine reagents undergo nucleophilicsubstitution of hydrogen (SNH) reactions with activated pyridines to afford pyridyl pyridinium salts in C4-selectivity. These salts can be in situ converted to 4-aminopyridines by aqueous ammonia or utilized as synthetic linchpins for general pyridine C4-functionalization. The elucidation of the selectivity principles has further guided the C4-selective
定制的吡啶试剂与活化的吡啶发生氢的亲核取代 (S N H) 反应,得到具有 C4 选择性的吡啶基吡啶鎓盐。这些盐可以通过氨水原位转化为 4-氨基吡啶,或用作一般吡啶 C4 官能化的合成关键。选择性原理的阐明进一步指导了其他(二)嗪的C4选择性官能化。