Recyclable Cu/C<sub>3</sub>N<sub>4</sub> composite catalyzed AHA/A<sup>3</sup> coupling reactions for the synthesis of propargylamines
作者:Hang Xu、Jun Wang、Peng Wang、Xiyu Niu、Yidan Luo、Li Zhu、Xiaoquan Yao
DOI:10.1039/c8ra06613b
日期:——
be efficient for the synthesis of propargylamines using a three-componentcouplingreaction of alkynes, CH2Cl2 and amines (AHA) without additional base. Moreover, the catalyst also showed highly catalytic activity in the synthesis of C1-alkynylated tetrahydroisoquinolines (THIQs) via an A3 reaction of alkynes, aldehydes and THIQ. The Cu/C3N4-catalyzed multicomponent reactions exhibited good functional
发现非均相 Cu/C 3 N 4催化剂可有效合成炔丙基胺,使用炔烃、CH 2 Cl 2和胺 (AHA) 的三组分偶联反应,无需额外碱。此外,该催化剂在通过炔烃、醛和 THIQ的 A 3反应合成 C1-炔基化四氢异喹啉 (THIQ) 中也表现出高度催化活性。Cu/C 3 N 4催化的多组分反应在大多数例子中表现出良好的官能团耐受性。此外,容易制备的 Cu/C 3 N 4催化剂可以方便地回收和重复使用5次以上而不会失去催化活性。
Effects of a Flexible Alkyl Chain on an Imidazole Ligand for Copper-Catalyzed Mannich Reactions of Terminal Alkynes
Copper-catalyzed Mannichreactions of terminal alkynes and secondary amines with aqueous formaldehyde can be accelerated by the use of a catalytic amount of an imidazole ligand carrying a long alkyl chain. The alkyl chain shows an efficient steric effect and helps the reaction. This imidazole ligand is efficient for various substrates, including even bulky alkynes.
MIL-101 supported highly active single-site metal catalysts for tricomponent coupling
作者:Weng-Jie Sun、En-Qing Gao
DOI:10.1016/j.apcata.2018.10.020
日期:2019.1
Metal-organic frameworks with regular pore structures provide powerful platforms for the design of single-site metal catalysts for chemical transformation. In this paper, we develop a facile, stable and recyclable MOF-supported Cu(II) catalyst, MIL-101-SO3Cu. It shows extremely high activity for the A(3) coupling of alkynes, aldehydes and amines. The turnover frequency can reach 6.8 x 10(5) h(-1) under neat conditions, which is the highest so far reported for the reaction. The high activity is because the specific structure of the MIL-101-SO3 support enables a single-site dispersion and an unhindered open environment for the metal ion. MIL-101-SO3Cu also exhibits high activity for the one-pot cascade reactions combining A(3) coupling and 5-endo-dig cyclization.