Gold-Catalyzed Synthesis of Functionalized Pyridines by Using 2<i>H</i>-Azirines as Synthetic Equivalents of Alkenyl Nitrenes
作者:Agnes Prechter、Guilhem Henrion、Pierre Faudot dit Bel、Fabien Gagosz
DOI:10.1002/anie.201402470
日期:2014.5.5
manipulated. 2H‐Azirines can be regarded as valuable synthetic equivalents of alkenyl nitrenes, however, reactions capitalizing on the cyclic strain of the heterocyclic motif and involving the cleavage of the CN single bond remain surprisingly limited. A gold‐catalyzed reaction that allows the formation of polysubstituted functionalized pyridines from easily accessible 2‐propargyl 2H‐azirine derivatives
2 H- zi嗪很容易从相应的酮中合成,尽管在一个紧张的三元循环中嵌有一个CN键,但它们足够稳定,可以分离,储存和操作。2 H zi嗪可被视为烯基氮烯的有价值的合成等价物,但是,利用杂环基序的循环应变并涉及C cle裂解的反应N个单键仍然令人惊讶地受到限制。开发了一种金催化的反应,该反应可从易于获得的2-炔丙基2H-叠氮基衍生物形成多取代的官能化吡啶。这种转变对应于烯基氮烯到炔烃的前所未有的分子内转移,在低催化剂负载下进行,效率高,并且具有很高的官能团耐受性和广泛的底物范围。