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 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
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.
Investigation towards the reductive amination of levulinic acid by B(C6F5)3/hydrosilane system
作者:Tianlong Wang、Hai Xu、Jianghua He、Yuetao Zhang
DOI:10.1016/j.tet.2020.131394
日期:2020.9
highly efficient strategy for the synthesis of N-heterocyclic compounds from the reductiveamination of the bio-derived levulinicacid and a wide range of anilines by metal-free B(C6F5)3/hydrosilane catalyst system. Through adjusting the amounts of hydrosilane, we can synthesize a series of pyrrolidones or pyrrolidines, respectively. Isotope-labeled NMR experiments were conducted to investigate the
将可再生生物质资源选择性转化为高附加值平台化学品对于可持续化学至关重要。在这里,我们报告了一种简单高效的策略,该方法由无金属的B(C 6 F 5)3 /氢硅烷催化剂体系通过生物衍生的乙酰丙酸和多种苯胺的还原胺化反应合成N-杂环化合物。通过调节氢硅烷的量,我们可以分别合成一系列的吡咯烷酮或吡咯烷。进行同位素标记的NMR实验以研究可能的反应途径。
Iron‐Catalysed Switchable Synthesis of Pyrrolidines
<i>vs</i>
Pyrrolidinones by Reductive Amination of Levulinic Acid Derivatives
<i>via</i>
Hydrosilylation
作者:Duo Wei、Chakkrit Netkaew、Christophe Darcel
DOI:10.1002/adsc.201801656
日期:2019.4.16
A selective production of pyrrolidines vs pyrrolidinones via hydrosilylation of levulinic acid and levulinates by switching of the iron complex catalyst is presented herein. The reactions proceeded efficiently with various anilines and alkylamines under both visible light irradiation and thermal conditions with 43 examples in isolated yields up to 93%. Noticeably, under similar conditions, cyclic amines