Zn(OTf)<sub>2</sub>-Catalyzed Formal [3 + 3] Cascade Annulation of Propargylic Alcohols with 2-Aminochromones: Accessing the Chromeno[2,3-<i>b</i>]pyridines
作者:Pei Tong、Zhou Sun、Shutao Wang、Yuan Zhang、Ying Li
DOI:10.1021/acs.joc.9b02120
日期:2019.11.1
A Zn(OTf)2-catalyzed formal [3 + 3] cascade annulation strategy for the synthesis of functionalized chromeno[2,3-b]pyridines has been developed using propargylic alcohols and 2-aminochromones as the substrates. The protocol provides a convenient and atom-economical method of accessing a broad range of chromeno[2,3-b]pyridine derivatives in excellent yields with good functional-group tolerance. The
使用炔丙醇和2-氨基色酮作为底物,已经开发了用于功能化苯并[2,3-b]吡啶合成的Zn(OTf)2催化的正式[3 + 3]级联环化策略。该协议提供了一种方便且原子经济的方法,以优异的收率和良好的官能团耐受性获得了广泛的chromeno [2,3-b]吡啶衍生物。该方法在克量级上也是有效的,这突出了这种合成转化的内在实用性。