Synthesis ( IF 2.2 ) Pub Date : 2019-02-19 , DOI: 10.1055/s-0037-1612250 Haojie Ji , Jianfeng Xu 1 , Hongjun Ren
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Abstract
An N-heterocyclic carbene (NHC)-catalyzed chemoselective intermolecular cross-benzoin reaction of aliphatic aldehydes with isatins is developed, affording biologically important 3-substituted 3-hydroxyoxindoles (on gram scale) in moderate to good yields (46–90%). The employment of a morpholinone-derived pentafluorophenyl-substituted triazolium salt as the electron-deficient NHC pre-catalyst is essential to make the reaction go through the cross-benzoin reaction pathway rather than the hydroacylation reaction pathway.
An N-heterocyclic carbene (NHC)-catalyzed chemoselective intermolecular cross-benzoin reaction of aliphatic aldehydes with isatins is developed, affording biologically important 3-substituted 3-hydroxyoxindoles (on gram scale) in moderate to good yields (46–90%). The employment of a morpholinone-derived pentafluorophenyl-substituted triazolium salt as the electron-deficient NHC pre-catalyst is essential to make the reaction go through the cross-benzoin reaction pathway rather than the hydroacylation reaction pathway.
中文翻译：
N-杂环碳烯催化脂族醛和靛红的化学选择性分子间联苯反应
抽象的
已开发出N-杂环卡宾（NHC）催化的脂族醛与靛红的化学选择性分子间交叉安息香反应，以中等至良好的收率（46-90％）提供了生物学上重要的3-取代的3-羟基氧吲哚（以克为单位）。使用吗啉酮衍生的五氟苯基取代的三唑鎓盐作为缺电子的NHC预催化剂对于使反应通过交叉安息香反应途径而非加氢酰化反应途径至关重要。
已开发出N-杂环卡宾（NHC）催化的脂族醛与靛红的化学选择性分子间交叉安息香反应，以中等至良好的收率（46-90％）提供了生物学上重要的3-取代的3-羟基氧吲哚（以克为单位）。使用吗啉酮衍生的五氟苯基取代的三唑鎓盐作为缺电子的NHC预催化剂对于使反应通过交叉安息香反应途径而非加氢酰化反应途径至关重要。
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