Alkylation of the α-amino C–H bonds of anilines photocatalyzed by a DMEDA-Cu-benzophenone complex: reaction scope and mechanistic studies
作者:Baptiste Abadie、Gediminas Jonusauskas、Nathan D. McClenaghan、Patrick Y. Toullec、Jean-Marc Vincent
DOI:10.1039/d1ob00960e
日期:——
complex 1 incorporating a BP chromophore is a highly active and chemoselective photocatalyst for the alkylation of α-amino C–H bonds of anilines. The reaction was shown to proceed with a broad substrate scope in the absence of additives. Extensive mechanisticstudies were performed, in particular using transient absorption spectroscopy, and spectroscopic signatures of key intermediates were identified
含有 BP 发色团的 Cu( II )配合物1是一种高活性和化学选择性的光催化剂,用于苯胺的 α-氨基 C-H 键的烷基化。该反应显示在没有添加剂的情况下以广泛的底物范围进行。进行了广泛的机理研究,特别是使用瞬态吸收光谱,并在催化条件下确定了关键中间体的光谱特征。最后,通过一锅法进行多组分 CuAAC 和烯烃加氢烷基化反应,展示了1作为多任务催化剂的能力。
Heterogeneous Visible-Light Photoredox Catalysis with Graphitic Carbon Nitride for α-Aminoalkyl Radical Additions, Allylations, and Heteroarylations
desilylative and decarboxylative additions, allylations, and heteroarylations in the presence of graphitic carbon nitride (g-C3N4) was developed. The procedure has broad scope and provides the desired products in high yields. The heterogeneous nature of the g-C3N4 catalytic system enables easy recovery and recycling as well as the use in multiple runs without loss of activity. The photoredox catalyzed reactions
已开发了在存在石墨化碳氮化物(gC 3 N 4)的情况下,进行甲硅烷基胺和α-氨基酸的光氧化活化的方案,以进行脱甲硅基和脱羧的加成,烯丙基化和杂芳基化。该方法具有广泛的范围,并以高收率提供了所需的产品。gC 3 N 4催化系统的非均质性质使其易于回收和循环利用,并且可以多次使用而不会损失活性。光氧化还原催化的反应也可以以连续的光流方式进行并按比例放大至克级。因此,稳定且容易获得的聚合物gC 3 N 4 提供了均相光敏剂的替代品,用于生成有价值的自由基中间体,用于合成和催化。
Visible-light-mediated addition of α-aminoalkyl radicals generated from α-silylamines to α,β-unsaturated carbonyl compounds
Visible-light-mediated addition of alpha-aminoalkyl radicals generated from alpha-silylamines to alpha,beta-unsaturated carbonylcompounds using a photoredox catalyst is developed. We also succeeded in the isolation of a silyl enol ether as a primary product of the photochemical reaction.
addition of amines and alkenes using metal-free conditions. Benzophenone was added as a photosensitizer to accelerate the single electron transfers, H-atom transfers and generation of α-aminoalkyl radicals. N-Alkyl anilines were alkylated with high selectivity and broad substrate scope.