Synthesis and Mechanistic Insights of the Formation of 3-Hydroxyquinolin-2-ones including Viridicatin from 2-Chloro-<i>N</i>,3-diaryloxirane-2-carboxamides under Acid-Catalyzed Rearrangements
作者:Vakhid A. Mamedov、Vera L. Mamedova、Zheng-Wang Qu、Hui Zhu、Venera R. Galimullina、Dmitry E. Korshin、Gul’naz Z. Khikmatova、Igor A. Litvinov、Shamil K. Latypov、Oleg G. Sinyashin、Stefan Grimme
DOI:10.1021/acs.joc.1c01592
日期:2021.10.1
duration of the reaction. A combined experimental and DFT mechanistic study of the formation of 1-benzyl-3-hydroxy-4-arylquinolin-2(1H)-ones showed that there are three competing reaction channels: (a) ring-closure via the ipso site, (b) ring-closure via the 1,2-Cl shift, and (c) ring-closure via the ortho site. Such mechanistic insights enabled an effective one-pot gram-scale synthesis of viridicatin
N -Benzyl-2-chloro - N ,3-diaryloxirane-2-carboxamides 在 Darzens 缩合条件下很容易从二氯乙酸的芳香醛和苯胺中获得,被证明是合成 3-羟基吲哚-2-酮的优良起始化合物, cyclohepto[ b ]pyrrole-2,3-diones 和 1-azaspiro[4.5]deca-3,6,9-triene-2-ones 通过 C(sp 2 )–C(sp 2 ) 键形成第一种情况和 C(sp 2 )–C(sp 3 ) 键在第二种和第三种情况下的形成。在优化的反应条件下,一锅法得到3-羟基吲哚-2-酮,其中包括N-苄基-2-氯-N的处理,3-二芳基环氧乙烷-2-甲酰胺与CF 3 CO 2 H 或AcOH/H 2 SO 4。在分子内环化的情况下,详细的反应通道强烈依赖于存在于苯胺组分和N-苄基-2-氯-N ,3-二芳基环氧乙烷-2-甲