Reductive Amination/Cyclization of Keto Acids Using a Hydrosilane for Selective Production of Lactams versus Cyclic Amines by Switching of the Indium Catalyst
作者:Yohei Ogiwara、Takuya Uchiyama、Norio Sakai
DOI:10.1002/anie.201509465
日期:2016.1.26
amines by reductive amination, using an indium/silane combination. This relatively benign and safe catalyst/reductant system tolerates the use of a variety of functional groups, especially ones that are reduction‐sensitive. A direct switch from synthesizing lactams to synthesizing cyclic amines is achieved by changing the catalyst from In(OAc)3 to InI3. This conversion occurs by further reduction of the
The synthesis of pyrrolidones via reductive amination of levulinic acid with aniline was examined over polypyrrolidone-stabilized metal nanoparticle catalysts. Among them, Ir metal was the most effective and applicable for the reductive amination of levulinic acid with nitroarenes/nitriles. Importantly, this catalyst was used for the one-potsynthesis of the anti-inflammatory drug indoprofen from 2-formylbenzoic
Direct Synthesis of Lactams from Keto Acids, Nitriles, and H<sub>2</sub>
by Heterogeneous Pt Catalysts
作者:S. M. A. H. Siddiki、Abeda S. Touchy、Ashvini Bhosale、Takashi Toyao、Yuji Mahara、Junya Ohyama、Atsushi Satsuma、Ken-ichi Shimizu
DOI:10.1002/cctc.201701355
日期:2018.2.21
We report herein the first general catalytic system for the direct synthesis of N‐substituted γ‐ and δ‐lactams by reductive amination/cyclization of keto acids (including levulinic acid) with nitriles and H2 under mild conditions (7 bar H2, 110 °C, solvent free). The most effective catalyst, Pt and MoOx co‐loaded TiO2 (Pt‐MoOx/TiO2), shows a wide substrate scope, high turnover number (TON), and good
我们在此报告的第一一般催化系统用于直接合成的N-取代的γ-和δ-内酰胺通过酮酸(包括乙酰丙酸)与腈和H还原胺化/环化2在温和条件下(7巴ħ 2,110 °C,无溶剂)。最有效的催化剂是Pt和MoO x共负载的TiO 2(Pt-MoO x / TiO 2),具有广泛的底物范围,高周转率(TON)和良好的可重复使用性。
Catalyst-free transformation of levulinic acid into pyrrolidinones with formic acid
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.
Synthesis of pyrrolidones and quinolines from the known biomass feedstock levulinic acid and amines
作者:Carmen Ortiz-Cervantes、Marcos Flores-Alamo、Juventino J. García
DOI:10.1016/j.tetlet.2016.01.018
日期:2016.2
cost effective synthetic strategy. Here, we describe the synthesis of a variety of N-(alkyl, aryl)-5-methyl-2-pyrrolidones through the reductive amination of levulinic acid using formic acid as the hydrogen source. This system is catalyzed by 3.8 nm ruthenium nanoparticles that were prepared by thermal decomposition of [Ru3(CO)12] in solvent-free conditions. When the reactions were carried out without