site‐selective C3‐arylation of N‐methyl‐2‐oxindole with arylboronic acids at room temperature in aqueous media to yield a series of 3‐aryl‐N‐methyl‐2‐oxindoles. This catalytic reaction progressed well with a low catalyst loading (0.01 mol %) under open‐flask conditions. Notably, a column‐chromatography‐free method for the quantitative preparation of C3‐arylated N‐methyl‐2‐oxindoles is reported. The catalyst
两种新型Pd II ONO钳形络合物可有效地用作均相催化剂,用于在室温下在水性介质中将N-甲基-2-氧吲哚与芳基硼酸进行定点C3芳基化,生成一系列3-芳基-N-甲基-2-氧吲哚 在开瓶条件下,该催化剂的催化反应进展顺利,催化剂负载量低(0.01 mol%)。值得注意的是,据报道,采用了无柱色谱法定量制备C3芳基化的N-甲基-2-氧吲哚。该催化剂与多种底物表现出良好的相容性,并在多达五个连续运行中具有可回收性,而没有明显的收率损失。
Palladium(II)/N-Heterocyclic Carbene Catalyzed One-Pot Sequential α-Arylation/Alkylation: Access to 3,3-Disubstituted Oxindoles
designed fluorene-based mono- and bimetallic Pd–PEPPSI complexes were synthesized and demonstrated to be effective for the one-pot sequential α-arylation/alkylation of oxindoles. This streamlined approach offers efficient access to functionalized 3,3-disubstitutedoxindoles in excellent yields (up to 89%) under mild reaction conditions.
Cyanomethylation of Substituted Fluorenes and Oxindoles with Alkyl Nitriles
作者:Gang Hong、Pradip D. Nahide、Marisa C. Kozlowski
DOI:10.1021/acs.orglett.0c00160
日期:2020.2.21
cyanomethylenation from alkyl nitriles of sp3 C–H bonds to afford quaternary carbon centers is described. This oxidative protocol is operationally simple and features good functional group compatibility. This method provides a novel approach to highly functionalized fluorene and oxindole derivatives, which are commonly used in material and pharmaceutical areas. Control experiments provide evidence of a radical
Iodine-Catalyzed Direct Olefination of 2-Oxindoles and Alkenes via Cross-Dehydrogenative Coupling (CDC) in Air
作者:Hong-Yan Huang、Hong-Ru Wu、Feng Wei、Dong Wang、Li Liu
DOI:10.1021/acs.orglett.5b01662
日期:2015.8.7
A direct intermolecular olefination of sp3 C–H bond between 2-oxindoles and simple alkenes via a Cross-Dehydrogenative Coupling (CDC) strategy has been developed. In the absence of additional base, moderate to excellent yields have been obtained by using a catalytic amount of iodine with atmospheric oxygen as the reoxidant. Based on the observation of a radical capture experiment, the transformation
A catalyst-free intermolecular <i>trans</i>-iodoalkylation of alkynes
作者:Jie-Jie Liu、Hong-Yan Huang、Liang Cheng、Qi Liu、Dong Wang、Li Liu
DOI:10.1039/c7ob03159a
日期:——
report the first catalyst-free and trans-selective iodoalkylation reaction of alkynes with a series of α-carbonyl compounds. This unprecedented three-component iodoalkylation reaction is enabled by using (iodoethynyl)trimethylsilane as a radical initiator and iodide source. The 1,2-difunctionalization affords alkenyl iodides, which are versatile building blocks for the construction of tri-substituted