Transition-metal-switchable divergent synthesis of nitrile-containing pyrazolo[1,5-a]pyridines and indolizines
作者:Chongjiu Lu、Min Ye、Min Li、Zhijierong Zhang、Yuxin He、Lipeng Long、Zhengwang Chen
DOI:10.1016/j.cclet.2021.04.018
日期:2021.12
pyridine-substituted acrylonitriles toward divergent fused N-heterocycles synthesis is reported. The heterodifunctionalization reaction with Cu(OAc)2 and urea as the nitrogen source accesses to nitrile-substituted pyrazolo[1,5-a]pyridines in moderate to good yields, while the homodifunctionalization reaction with FeBr3 leads to synthesis of nitrile-substituted indolizines in excellent yields.
报道了钯取代的丙烯腈对发散的稠合N-杂环合成的钯催化的氧化形式[4 + 1]环化。以Cu(OAc)2和尿素为氮源的异双官能化反应以中等至良好的产率进入腈取代的吡唑并[1,5-a]吡啶,而与FeBr 3的均双官能化反应导致腈取代的吲哚嗪的合成高产。