Starting from nitroarenes, under hydrosilylation conditions, using a well-defined N-heterocycliccarbeneiron(0) catalyst, (IMes)Fe(CO)4, the corresponding aniline derivatives were produced in 61–92% isolated yields. More impressively, a selective synthesis of cyclic amines such as pyrrolidines, piperidines and azepanes were conducted from levulinic acid, 1,5- and 1,6-keto acids, respectively. The
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
Practical direct synthesis of <i>N</i>-aryl-substituted azacycles from <i>N</i>-alkyl protected arylamines using TiCl<sub>4</sub> and DBU
作者:Van Hieu Tran、Minh Thanh La、Soosung Kang、Hee-Kwon Kim
DOI:10.1039/d0ob00880j
日期:——
A noveltransformation of N-alkyl protected arylamines and cyclic ethers into N-aryl substituted azacycles is described. Alkyl groups have been used for the protection of amines in organic syntheses. In this synthesis, N-alkyl protected arylamines were reacted with cyclic ethers in the presence of TiCl4 and DBU, crucial reagents affording five- and six-membered azacycles. In particular, utilization
Synthesis of N-aryl substituted, five- and six-membered azacycles using aluminum-amide complexes
作者:Balaji L. Korbad、Sang-Hyeup Lee
DOI:10.1039/c4cc04111a
日期:——
Synthesis of N-arylsubstituted, five- and six-membered azacycloalkanes, isoindolines and tetrahydroisoquinolines, has been described. In this synthesis, cyclic ethers (n = 1, 2) were treated with dimethylaluminum-amide reagents, derived from a range of aryl amines and trimethylaluminum, to afford the corresponding azacycles in good yields.