Transition-Metal-Free Synthesis of Pyridine Derivatives by Thermal Cyclization of N-Propargyl Enamines
作者:Yuya Chikayuki、Takakane Miyashige、Shiori Yonekawa、Akiko Kirita、Natsuko Matsuo、Hiroyoshi Teramoto、Shigeru Sasaki、Kimio Higashiyama、Takayasu Yamauchi
DOI:10.1055/s-0039-1691575
日期:2020.4
A transition-metal-free synthesis of pyridine derivatives by 6-endo-dig cyclization of N-propargyl enamines was developed. This method is environmentally friendly and is a high atom economy reaction that is easily accessed to provide pyridine derivatives in moderate to good yield by heating N-propargyl enamines in solvent without additives. The total synthesis of onychine was achieved in 51% yield
通过N-炔丙基烯胺的6-内-挖-环化,开发了无过渡金属合成吡啶衍生物。该方法是环境友好的,并且是高度原子经济的反应,通过在没有添加剂的溶剂中加热N-炔丙基烯胺,可以容易地获得吡啶衍生物以中等至良好的产率。使用该方法,仅需两个步骤,即可以51%的收率完成Onychine的全合成。