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。
Oxygen Switch in Visible-Light Photoredox Catalysis: Radical Additions and Cyclizations and Unexpected C–C-Bond Cleavage Reactions
作者:Shaoqun Zhu、Arindam Das、Lan Bui、Hanjun Zhou、Dennis P. Curran、Magnus Rueping
DOI:10.1021/ja309580a
日期:2013.2.6
oxygen, a radical addition/cyclization reaction occurred which resulted in the formation of tetrahydroquinoline derivatives in good yields under mild reaction conditions. The intramolecular version of the radical addition led to the unexpected formation of indole-3-carboxaldehyde derivatives. Mechanistic investigations of this reaction cascade uncovered a new photoredoxcatalyzed C-C bond cleavage reaction
A redox-neutral reaction without using any external oxidant and reductant in one pot is described. By combining a Ru(bpy)32+ photocatalyst and cobaloxime catalyst, a number of tertiaryanilines can be oxidized by Ru(bpy)32+ to realize oxidative cyclization of tetrahydroquinolines, and the electron and proton eliminated from the substrate anilines are captured by a cobaloxime catalyst to achieve hydrogen
We describe a three-componentreaction of malononitrile, benzaldehyde and N,N-dimethylaniline using aluminium doped CdSeS/CdZnSeS(Al)/ZnS quantum dots (QDs) as visible light catalysts to synthesize α-aminobutyrilitriles at room temperature and under mild conditions. The reactions exhibit high functional group tolerance, and the well dispersed quantum dot catalysts are highly efficient with a turnover
Lewis Acid-Conjugated Pyrene Photoredox Catalyst Promoting the Addition Reaction of α-Silyl Amines with Benzalmalononitriles
作者:Yuri Katayama、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1248/cpb.c22-00526
日期:2022.11.1
We developed the additionreaction of α-silyl amines with benzalmalononitriles catalyzed by a Mg2+-conjugated pyrene catalyst under visible light irradiation. The catalytic activity of this complex was higher than pyrene alone, a Mg2+ Lewis acid alone, and the sum of these two independent catalytic elements. The observed enhancement in catalytic activity was likely due to electrostatic interactions