Base-Mediated Hydroamination of Propargylamine: A Regioselective Intramolecular 5-exo-dig Cycloisomerization en Route to Imidazole-2-thione
摘要:
An intramolecular transition-metal-free base-mediated hydroamination of propargylamine with isothiocyanates has been achieved. This atom-economical, regioselective intramolecular 5-exo-dig cycloisomerization was utilized for the one-pot synthesis of diversely substituted imidazole-2-thione and spiro-cyclic imidazolidine-2-thione. The reaction goes to completion at room temperature via propargylthiourea and 6597% isolated yields were obtained.
Thiol-Yne Coupling of Propargylamine under Solvent-Free Conditions by Bond Anion Relay Chemistry: An Efficient Synthesis of Thiazolidin-2-ylideneamine
作者:Alok Ranjan、Abhijit S. Deore、Swapnil G. Yerande、Dattatraya H. Dethe
DOI:10.1002/ejoc.201700603
日期:2017.8.2
Thiol-ynecoupling of propargylamine with isothiocyanate has been developed under metal and solvent free condition. The addition of propargylamine on isothiocyanate gives propargylthiourea. This intermediate in situ undergoes intramolecular 5-exo-dig cyclization to give thiazolidin-2-ylideneamine. This through bondanionrelay reaction occurs by attack of sulphur (not nitrogen) on alkyne in highly
The potential of copper(I)-zeolite catalysis was evaluated in the three-component KA2-coupling mediated synthesis of α-tertiary propargylamines. Our archetypal copper(I)-doped zeolite CuI-USY proved to be efficient under ligand- and solvent-free conditions at 80 °C. Usable up to four times, this catalytic material enables the coupling of diverse ketones, alkynes, and amines with a broad functional
在三组分 KA 2 -偶联介导的 α-叔炔丙胺合成中评估了铜 (I)-沸石催化的潜力。我们的原型铜 (I) 掺杂沸石 Cu I -USY 在 80 °C 下被证明在无配体和无溶剂条件下是有效的。这种催化材料最多可使用四次,能够将具有广泛官能团耐受性的各种酮、炔和胺偶联。还建立了分别涉及炔酸和三甲基甲硅烷基乙炔作为炔烃替代物的脱羧和脱甲硅烷化版本,以绕过选择性问题和/或获得在标准 KA 2条件下无法获得的 α-叔炔丙胺。有趣的是,KA 2型偶联反应成功地与其他 Cu I催化反应相关联,从而在完全 Cu I -USY 催化下形成连续的一锅法。
Manganese‐Catalyzed Multicomponent Synthesis of Tetrasubstituted Propargylamines: System Development and Theoretical Study
作者:Stavros P. Neofotistos、Nikolaos V. Tzouras、Martin Pauze、Enrique Gómez‐Bengoa、Georgios C. Vougioukalakis
DOI:10.1002/adsc.202000566
日期:2020.9.21
Herein, we report a catalytic system based on the earth‐abundant manganese for the ketone, amine, alkyne (KA2) reaction. The efficiency of manganese manifests at relatively high temperatures, combined with sustainable reaction conditions, and provides a tool for accessing propargylamines from structurally diverse starting materials, including synthetically relevant and bioactive molecules. Our efforts
Copper/DTBP-Promoted Oxyselenation of Propargylic Amines with Diselenides and CO<sub>2</sub>: Synthesis of Selenyl 2-Oxazolidinones
作者:Jia-Min Chen、Lin Qi、Linlin Zhang、Li-Jun Li、Cong-Ying Hou、Wei Li、Li-Jing Wang
DOI:10.1021/acs.joc.0c01519
日期:2020.8.21
A highly efficient electrophilic oxyselenation of propargylic amines with diselenides and CO2 under atmospheric pressure promoted by copper/DTBP is reported. Various biologically important selenyl 2-oxazolidinones were produced in moderate to excellent yields. The developed method features a broad substrate scope, easy scalability, and mild reaction conditions.
Cadmium‐Doped and Pincer Ligand‐Modified Gold Nanocluster for Catalytic KA
<sup>2</sup>
Reaction
作者:Ji‐Qiang Fan、Ying Yang、Cheng‐Bo Tao、Man‐Bo Li
DOI:10.1002/anie.202215741
日期:2023.2
A goldnanocluster Au17Cd2 (PNP)2 (SR)12 with an icosahedral Au13 kernel, two PNP pincer ligands and two Au2Cd (SR)6 staple motifs has been developed as an efficient catalyst for the KA2 reaction. The cooperation between the three parts of the goldnanocluster has been verified as contributing to its high activity.
金纳米团簇 Au 17 Cd 2 (PNP) 2 (SR) 12具有二十面体 Au 13内核、两个 PNP 钳形配体和两个 Au 2 Cd (SR) 6主基序已被开发为 KA 2反应的有效催化剂。金纳米团簇的三个部分之间的合作已被证实有助于其高活性。