Dichotomy of Reductive Addition of Amines to Cyclopropyl Ketones vs Pyrrolidine Synthesis
作者:Oleg I. Afanasyev、Alexey A. Tsygankov、Dmitry L. Usanov、Denis Chusov
DOI:10.1021/acs.orglett.6b02945
日期:2016.11.18
interesting catalytic dichotomy was discovered: switching between simple ligand-free catalysts leads to fundamentally different outcomes of reductive reaction between amines and α-carbonylcyclopropanes. Whereas a rhodium catalyst leads to the traditional reductive amination product, ruthenium catalysis enables a novel reaction of pyrrolidine synthesis via ring expansion. The protocols do not require an
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
Reductive amination/cyclization of levulinic acid to pyrrolidones versus pyrrolidines by switching the catalyst from AlCl<sub>3</sub> to RuCl<sub>3</sub> under mild conditions
作者:Cailing Wu、Xiaoying Luo、Hongye Zhang、Xinwei Liu、Guipeng Ji、Zhenghui Liu、Zhimin Liu
DOI:10.1039/c7gc00999b
日期:——
Herein the reductiveamination/cyclization of levulinicacid using phenylsilane was presented to selectively produce pyrrolidones versus pyrrolidines under mild conditions by switching the catalyst from AlCl3 to RuCl3. Using AlCl3 as the catalyst, pyrrolidones were solely obtained at room temperature, while RuCl3 as the catalyst selectively afforded pyrrolidines in high yields at 45 °C.
Practical catalytic method for synthesis of sterically hindered anilines
作者:Melrose Mailig、Richard P. Rucker、Gojko Lalic
DOI:10.1039/c5cc03565a
日期:——
A practical catalytic method for the synthesis of sterically hinderedanilines is described. The amination of aryl and heteroaryl boronicesters is accomplished using a catalyst prepared in situ from...