InCl<sub>3</sub>/TfOH-Mediated Convenient Synthesis of 3-Alkylideneoxindoles from 2-Oxindoles with 1,3-Diones, Ketones, or Aldehydes
作者:Xia Chen、Xiao-Yu Zhou、Hai-Long Liu、Chao Ding、Jin-Hui Li
DOI:10.1021/acs.joc.4c00202
日期:2024.4.5
methods for the synthesis of 3-alkylideneoxindoles are described in this paper. The InCl3/TfOH-mediated tandem Knoevenagel condensation–deacylation sequence of various 2-oxindoles with 1,3-diones or acetoacetate furnished 3-alkylideneoxindoles in satisfactory to excellent yields (up to >99% yield). Employing the reaction system, the condensation of 2-oxindoles with ketones or aldehydes also proceeded
本文描述了两种高效、便捷的 3-亚烷基氧吲哚合成方法。 InCl 3 /TfOH介导的各种2-羟吲哚与1,3-二酮或乙酰乙酸酯的串联Knoevenagel缩合-脱酰化序列以令人满意的至极好的产率(高达> 99%产率)提供了3-亚烷基羟吲哚。利用该反应体系,2-羟吲哚与酮或醛的缩合反应也能顺利进行,生成3-亚烷基羟吲哚。该协议可以扩大规模。研究了酸对该缩合反应的影响和分子间竞争实验,以了解该反应的情况。