[3 + 2]-Annulation of <i>gem</i>-Difluoroalkenes and Pyridinium Ylides: Access to Functionalized 2-Fluoroindolizines
作者:Jun-Qi Zhang、Dandan Hu、Jinyu Song、Hongjun Ren
DOI:10.1021/acs.joc.0c03041
日期:2021.3.19
A [3 + 2]-annulation of gem-difluoroalkenes and pyridinium ylides was developed employing ambient air as the sole oxidant in an open-vessel manner, affording a series of multifunctionalized 2-fluoroindolizines in moderate to good yields. In this reaction, gem-difluoroalkene acts as a C2 synthon and entirely avoids the competitive addition–elimination process, which provides facile access to 2-fluoroindolizines
开发了宝石-二氟烯烃和吡啶鎓吡啶鎓的[3 + 2]环空反应,以开敞的方式使用环境空气作为唯一的氧化剂,以中等至良好的收率提供了一系列多官能化的2-氟吲哚并嗪。在该反应中,宝石-二氟烯烃充当C2合成子,完全避免了竞争性加成-消除过程,该过程提供了轻松获得2-氟吲哚嗪的途径。