Ooh LA LA: The reductive amination of levulinic acid with a variety of aliphatic amines and aniline derivatives including stericallyhinderedamines is presented. The reaction is promoted by an iridium catalyst operating at low loading and 5 bar H2 under neat conditions. The catalyst was also efficient for the synthesis of N-aryl isoindolinone in high yields.
Ooh LALA:提出了乙酰丙酸与多种脂族胺和苯胺衍生物(包括位阻胺)的还原胺化反应。铱催化剂在低负载和5 bar H 2的纯净条件下运行可促进反应。该催化剂对于高产率地合成N-芳基异吲哚啉酮也是有效的。
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
Levulinic acid (LA) is transformed into pyrrolidinones via iridium-catalysed reductive amination using formic acid as the hydrogen source under aqueous conditions. The catalytic system is the most active and performs under the mildest conditions ever reported for the reductive amination of LA.
The aqueous phase catalytic reductiveamination of levulinicacid (LA) into pyrrolidones and 2-formylbenzoic acid into N-arylisoindolines is reported. The catalytic reaction involves an iridium catalyst bearing an electron-rich dipyridylamine ligand and uses formic acid as a hydrogen source. The chemoselective iridium catalyst displayed high efficiency for the synthesis of a variety of N-substituted
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