Cu6Se4.5 Nanoparticles from a single source precursor: Recyclable and efficient catalyst for cross-dehydrogenative coupling of tertiary amines with terminal alkynes
作者:Sonu Gupta、Hemant Joshi、Nidhi Jain、Ajai K. Singh
DOI:10.1016/j.molcata.2016.06.005
日期:2016.11
Abstract The use of copper selenide nanocatalyst for an efficient and regioselective cross-dehydrogenativecoupling (CDC) of tertiaryamines with terminalalkynes in the presence of tert-butyl hydroperoxide as the oxidant is demonstrated for the first time. The catalyst comprising of unique Cu6Se4.5 nanoparticles synthesized from a single source precursor CuSePh, is required in much lower amount (1 mol%)
convenient and efficient method for coupling of tertiary aliphatic amines with terminal alkynes to propargylamines via C−H activation. The protocol uses CuBr as the catalyst, NBS as the free radical initiator, CH3CN as the solvent, and the alkynylation was selectively performed on the methyl of tertiary aliphatic amines at 80 °C. This is an economical and practical method for the synthesis of propargylamines
A microwave-enhanced, solventless Mannich condensation of terminal alkynes and secondary amines with para-formaldehyde on cuprous iodide doped alumina
作者:George W. Kabalka、Li-Li Zhou、Lei Wang、Richard M. Pagni
DOI:10.1016/j.tet.2005.10.049
日期:2006.1
A microwave-enhanced, solventless Mannich condensation of terminal alkynes and secondary amines with para-formaidehyde on cuprous iodide doped alumina has been developed. beta-Aminoalkynes are generated in good yields. The reaction can be extended to include a cyclization, which affords 2-substituted benzo[b]furans. The chemoselectivity of the reaction indicates that terminal alkynes are much more reactive than enolizable ketones under the reaction conditions. (c) 2005 Elsevier Ltd. All rights reserved.
Metal-Free Decarboxylative Three-Component Coupling Reaction for the Synthesis of Propargylamines
作者:Kyungho Park、Yumi Heo、Sunwoo Lee
DOI:10.1021/ol401358t
日期:2013.7.5
A metal-free decarboxylative three-component coupling reaction was developed. When alkynyl carboxylic acids, paraformaldehyde, and amines were reacted in CH3CN at 65 degrees C for 3 h, the desired propargylamines were obtained in good yields. This coupling reaction also showed good yield in water solvent. This reaction showed higher selectivity toward alkynyl carboxylic acids than a terminal alkyne.
Oxidative C–C bond formation and C–N bond cleavage catalyzed by complexes of copper(<scp>i</scp>) with acridine based (E N E) pincers (E = S/Se), recyclable as a catalyst
作者:Sonu Gupta、Pooja Dubey、Ajai K. Singh、Nidhi Jain
DOI:10.1039/c9dt01766f
日期:——
Copper(I) complexes of 4,5-bis((phenylthio/seleno)methyl)acridine, [CuLBr] (C1 and C2) (L = L1/L2; pincer type (E N E) ligand), were synthesized and found to be thermally stable, and moisture and air insensitive. The complexes and ligands were characterized by multinuclei NMR and single crystal X-ray diffraction. In both complexes C1 and C2, ligands L1 and L2 coordinate with Cu in a pincer mode furnishing
合成并发现了4,5-双((苯硫基/硒代)甲基),啶的铜(I)配合物[Cu L Br](C1和C2)(L = L1 / L2;钳型(ENE)配体)具有热稳定性,对湿气和空气不敏感。配合物和配体通过多核NMR和单晶X射线衍射进行表征。在复合物C1和C2中,配体L1和L2与铜以钳位模式配位,提供两个六元螯合环,施主原子的四面体几何形状在铜周围变形。Cu–S和Cu–Se键长(Å)分别为2.2482(17)–2.2979(16)和2.3603(14)–2.4177(13)。这些络合物是未活化的叔胺与未活化的末端炔烃交叉脱氢偶联以及在无氧化溶剂的条件下裂解N,N二甲基苄胺的苄基(C–N)键的有效催化剂。发现反应是高度选择性的,并且未观察到对酸的过度氧化。1.0mol%的低催化负载量足以使这两种转化具有高达五倍的可回收性。