The synthesis of pyrrolidinones from reductive amination of levulinic acid (LA) with primary amines is reported. Pyrrolidinones have various applications such as surfactants, pharmaceutical intermediates, dispersants, and solvents. The half‐sandwich Cp*Ir complex (Cp* is 1,2,3,4,5‐pentamethylcyclopenta‐1,3‐diene) coordinated by bipyridine ligand bearing both dimethylamino and ortho‐hydroxyl groups
Ambient Reductive Amination of Levulinic Acid to Pyrrolidones over Pt Nanocatalysts on Porous TiO<sub>2</sub> Nanosheets
作者:Chao Xie、Jinliang Song、Haoran Wu、Yue Hu、Huizhen Liu、Zhanrong Zhang、Pei Zhang、Bingfeng Chen、Buxing Han
DOI:10.1021/jacs.8b13024
日期:2019.3.6
Construction of N-substituted pyrrolidones from biomass-derived levulinicacid (LA) via reductive amination is a highly attractive route for biomass valorization. However, realizing this transformation using H2 as the hydrogen source under mild conditions is still very challenging. Herein, we designed porous TiO2 nanosheets-supported Pt nanoparticles (Pt/P-TiO2) as the heterogeneous catalyst. The prepared Pt/P-TiO2
通过还原胺化从生物质衍生的乙酰丙酸 (LA) 构建 N 取代的吡咯烷酮是一种极具吸引力的生物质价值化途径。然而,在温和条件下使用 H2 作为氢源实现这种转化仍然非常具有挑战性。在此,我们设计了多孔 TiO2 纳米片负载的 Pt 纳米粒子(Pt/P-TiO2)作为多相催化剂。制备的 Pt/P-TiO2 在环境温度和 H2 压力下对 LA 的还原胺化非常有效,以生产各种 N-取代的吡咯烷酮(34 个实例)。同时,Pt/P-TiO2对乙酰丙酸酯、4-乙酰丁酸、2-乙酰苯甲酸和2-羧基苯甲醛的还原胺化显示出良好的适用性。
Synthesis of nitrogen-containing heterocycles using exo- and endo-selective radical cyclizations onto enamides
predominantly gave 6-endo cyclization products. These results suggest that the exo or endo selectivity of radicalcyclizationonto the alkenic bond of enamides can be controlled by positional change of the carbonyl group. For an understanding of these selectivities, heat of formation for each transition state was calculated. 6-endo-Selective radicalcyclization was applied to the radical cascade, enabling
Ambient reductive synthesis of N-heterocyclic compounds over cellulose-derived carbon supported Pt nanocatalyst under H<sub>2</sub>atmosphere
作者:Yunyan Wu、Yanfei Zhao、Huan Wang、Fengtao Zhang、Ruipeng Li、Junfeng Xiang、Zhenpeng Wang、Buxing Han、Zhimin Liu
DOI:10.1039/d0gc01177k
日期:——
enhancing electron density of the Pt nanoparticles and activating reactant molecules. Especially, the O-containing groups on the c-C surface provided the c-C support with both acid and base features, thus endowing Pt/c-C with high performances. This work provides an accessible and highlyefficientcatalyst for reductive synthesis of N-heterocycles using H2 under ambient conditions, which may have promising
Levulinic acid (LA) is transformed into pyrrolidinones by formic acid in DMSO without a catalyst. Mechanistic studies suggest the involvement of an iminium intermediate and a rate-limiting hydride transfer step.