Iodine Mediated Base‐Controlled Regio‐Selective Annulation of 2‐(Pyridin‐2‐yl)acetate Derivatives with Acrylic Esters for the Synthesis of Indolizines
作者:Youlai Fang、Fei Li、Yuzhu Yang、Xiaolan Liu、Weidong Pan
DOI:10.1002/adsc.202000103
日期:2020.3.17
An iodine mediated base‐controlled reaction between 2‐(pyridin‐2‐yl)acetate derivatives and acrylic esters has been developed for the selective synthesis of 1,3‐disubstituted indolizines and 1,2‐disubstituted indolizines. A single‐pot reaction of 2‐(pyridin‐2‐yl)acetate derivatives and acrylic esters in the presence of CsOAc delivers 1,3‐disubstitued indolizines, while KHCO3 promotes the formation
已经开发出碘介导的2-吡啶(2-吡啶基)乙酸酯衍生物与丙烯酸酯之间的碱控制反应,用于选择性合成1,3-二取代的吲哚嗪和1,2-二取代的吲哚嗪。在存在CsOAc的情况下,2-(吡啶-2-基)乙酸酯衍生物和丙烯酸酯的单锅反应可生成1,3-二取代的吲哚嗪,而KHCO 3促进C3-碘吲哚的生成,这可能进一步被破坏。在铜粉存在下碘化,通过连续的逐步方式得到1,2-二取代的吲哚嗪。对于该反应,已经提出了涉及自由基过程的合理的反应机理。已经描述了C3-碘吲哚嗪与芳基硼酸的钯催化过氧化反应。