使用 Me 3 SiX 类型的有机硅化合物(X = CN、N 3、C n F 2n+1和卤素)和胺碱,由相应的烷基氢过氧化物原位生成烷基甲硅烷基过氧化物。随后的原位铜催化均裂烷基过氧化硅得到烷基自由基,然后被亲核试剂 X (X = CN, N 3 , C n F 2n+1, 和卤素) 以提供具有新碳-碳、碳-氮或碳-卤素键的偶联产物,产率从好到高。此外,1-(三甲基甲硅烷基)吗啉还可用于原位生成过氧化烷基甲硅烷基,随后高效地用于酰胺的N-烷基化、芳基化和硼基化。
A cheap iron-catalyzed C–C bond cleavage/thiolation and selenylation of cycloalkyl hydroperoxides are presented. This redox-neutral protocol provides efficient access to diverse distal keto-functionalized thioethers and selenium compounds. Remarkably, only some amounts of disulfides are required for this transformation.
The Formation of C–C or C–N Bonds via the Copper-Catalyzed Coupling of Alkylsilyl Peroxides and Organosilicon Compounds: A Route to Perfluoroalkylation
作者:Weiping Xu、Yan Liu、Terumasa Kato、Keiji Maruoka
DOI:10.1021/acs.orglett.1c00215
日期:2021.3.5
The copper-catalyzed selective cleavage of alkylsilyl peroxides and the subsequent formation of carbon–carbon or carbon–nitrogen bonds with organosilicon compounds are described. The reaction proceeds under mild conditions and exhibits a broad substrate scope with respect to both cyclic and acyclic alkylsilyl peroxides in combination with carbon and nitrogen sources. In particular, this approach enables
novel method for the generation of alkyl radicals from alkylsilyl peroxides and their applications to the Cu-catalyzed mono-N-alkylation of amides or arylamines, and to the O-alkylation of carboxylic acids. The use of alkylsilyl peroxides as alkyl radical sources includes the following synthetic advantages: i) various alkylsilyl peroxides can be readily synthesized from the corresponding alcohols and be
An efficient copper-catalyzed radical ring-opening halogenation with HX (aq) is described. This protocol features redox-neutral conditions, green halogen sources, and a broad substrate scope, providing practical access to distally chlorinated, brominated and iodinated alkyl ketones and alkyl nitriles with moderate to good yields.
Cu-Catalyzed <i>O</i>-alkylation of phenol derivatives with alkylsilyl peroxides
作者:Shunya Sakurai、Taichi Kano、Keiji Maruoka
DOI:10.1039/d0cc07305a
日期:——
A Cu-catalyzed O-alkylation of phenol derivatives using alkylsilyl peroxides as alkyl radical precursors is described. The reaction proceeds smoothly under mild reaction conditions and the use of two different ligands with a Cu catalyst provides a wide range of products. A mechanistic study suggested that the reaction proceeds via a radical mechanism.