Synthesis of heteroleptic copper(I) complexes with phosphine-functionalized thiosemicarbazones: An efficient catalyst for regioselective N -alkylation reactions
作者:Rangasamy Ramachandran、Govindan Prakash、Paranthaman Vijayan、Periasamy Viswanathamurthi、Jan Grzegorz Malecki
DOI:10.1016/j.ica.2017.05.003
日期:2017.8
spectral and analytical technique. The single-crystal X-ray diffraction study of complexes 2 and 3 confirmed the formation of complexes with Cu(I) ion, coordinated through P,N,S-donor atoms from the phosphino-thiosemicarbazone ligands. All the copper(I) complexes have been demonstrated as highly efficient catalysts for the synthesis of N-alkylated heterocyclic amine by the coupling of primary amines with
摘要三种新的杂合铜(I)配合物[Cu(PPh3)(PNS-H)](1)(PNS-H = 2-(2-(2-(二苯基膦基)亚苄基)硫代半脲),[Cu(PPh3)(PNS-Me )](2)(PNS-Me = 2-(2-(二(苯基苯基膦基)亚苄基)-4-甲基-3-硫代半脲酮)和[Cu(PPh3)(PNS-Et)](3)(PNS-Et = 2 -(2-(二苯基膦基)亚苄基)-4-乙基-3-硫代半碳酰胺已被合成并通过各种光谱和分析技术进行了表征。配合物2和3的单晶X射线衍射研究证实了与Cu(I)离子形成了配合物,并通过膦-硫代半脲配体的P,N,S供体原子进行了配位。已证明所有铜(I)配合物都是在低催化剂负载量下将伯胺与醇偶联的合成N-烷基化杂环胺的高效催化剂,最高收率可达99%。N-烷基化反应很容易在中等条件下进行,而水的释放是唯一的副产物。另外,还研究了取代基对配体,溶剂,碱和催化剂负载量对配合物催