Metal-Free Synthesis of C-4 Substituted Pyridine Derivatives Using Pyridine-boryl Radicals via a Radical Addition/Coupling Mechanism: A Combined Computational and Experimental Study
作者:Guoqiang Wang、Jia Cao、Liuzhou Gao、Wenxin Chen、Wenhao Huang、Xu Cheng、Shuhua Li
DOI:10.1021/jacs.7b00823
日期:2017.3.15
that the pyridine-boryl radical generated in situ using 4-cyanopyridine and bis(pinacolato)diboron could be used as a bifunctional "reagent", which serves as not only a pyridine precursor but also a boryl radical. With the unique reactivity of such radicals, 4-substituted pyridine derivatives could be synthesized using α,β-unsaturated ketones and 4-cyanopyridine via a novel radical addition/C-C coupling
密度泛函理论研究表明,使用 4-氰基吡啶和双(频哪醇)二硼原位生成的吡啶-硼基自由基可用作双功能“试剂”,其不仅可用作吡啶前体,还可用作硼基自由基。由于这些自由基的独特反应性,可以使用α,β-不饱和酮和4-氰基吡啶通过新型自由基加成/CC偶联机制合成4-取代吡啶衍生物。进行了几个对照实验,为所提出的机制提供支持性证据。除了烯酮,范围还可以扩展到广泛的硼基自由基受体,包括各种醛和酮、芳基亚胺和炔酮。最后,这种转化应用于复杂药物分子的后期修饰。