Pd(II)-Catalyzed Ligand-Controlled Synthesis of 2,3-Dihydroisoxazole-4-carboxylates and Bis(2,3-dihydroisoxazol-4-yl)methanones
摘要:
Pd(II)-catalyzed ligand-controlled switching between cyclization-carbonylation and cyclization-carbonylation-cyclization-coupling (CCC-coupling) reactions of propargylic N-hydroxylamines was investigated. The use of a [Pd(tfa)2(box)] catalyst in MeOH afforded symmetric ketones bearing two 2,3-dihydroisoxazoles in good yields; replacing the catalyst and solvent with Pd(tfa)(2) and MeOH/DMSO led to the formation of methyl 2,3-dihydroisoxazole-4-carboxylates in good yields.
Regio-selective and stereo-selective hydrosilylation of internal alkynes catalyzed by ruthenium complexes
作者:Wenhao Dai、Xiaowei Wu、Chunpu Li、Rui Zhang、Jiang Wang、Hong Liu
DOI:10.1039/c8ra04083d
日期:——
In this study, ruthenium(II)-catalyzed direct hydrosilylation of internal alkynes with high regio-selectivity and stereo-selectivity is reported. This title transformation led to various vinylsilanes in good to excellent yields. This approach features mild reaction conditions, low catalyst loading, air-stability, and good functional group tolerance. Furthermore, gram-scale preparation and some transformations
本研究报道了具有高区域选择性和立体选择性的钌( II )催化的内部炔烃的直接氢化硅烷化。这种标题转变导致各种乙烯基硅烷的产率从良好到极好。该方法具有反应条件温和、催化剂负载量低、空气稳定性好、官能团耐受性好等特点。此外,对乙烯基硅烷进行了克级制备和一些转化,进一步强调了其合成效用和适用性。
Ruthenium-Catalyzed Redox-Neutral [4 + 1] Annulation of Benzamides and Propargyl Alcohols via C–H Bond Activation
作者:Xiaowei Wu、Bao Wang、Shengbin Zhou、Yu Zhou、Hong Liu
DOI:10.1021/acscatal.7b00031
日期:2017.4.7
transition-metal-catalyzed cycloaddition reactions, in which they generally serve as two-carbon reaction partners. Herein, we report ruthenium(II)-catalyzed redox-neutral [4 + 1] annulation of benzamides and propargyl alcohols, in which propargyl alcohols act as one-carbon units. This synthetic utility of propargyl alcohols led to a series of potentially bioactive N-substituted quaternary isoindolinones
Propargyl Alcohols as One-Carbon Synthons: Redox-Neutral Rhodium(III)-Catalyzed C–H Bond Activation for the Synthesis of Isoindolinones Bearing a Quaternary Carbon
作者:Xiaowei Wu、Bao Wang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.7b00089
日期:2017.3.17
C–H activation/subsequent [4 + 1] cyclization reactions between benzamides and propargyl alcohols are reported in which propargyl alcohols serve as unusual one-carbon units. This title transformation led to a series of isoindolinones bearing a quaternary carbon with moderate to good yields without the requirement for external metal oxidants. Due to the mild and simple reaction conditions, this reaction
Pd(II)-catalyzed ligand-controlled switching between cyclization-carbonylation and cyclization-carbonylation-cyclization-coupling (CCC-coupling) reactions of propargylic N-hydroxylamines was investigated. The use of a [Pd(tfa)2(box)] catalyst in MeOH afforded symmetric ketones bearing two 2,3-dihydroisoxazoles in good yields; replacing the catalyst and solvent with Pd(tfa)(2) and MeOH/DMSO led to the formation of methyl 2,3-dihydroisoxazole-4-carboxylates in good yields.