Synthesis and Characterization of Amidato Divalent Lanthanide Complexes and Their Use in Forming 2,4-Quinazolidinones from CO<sub>2</sub>and 2-Aminobenzonitriles
作者:Qianyu Wang、Chengrong Lu、Bei Zhao、Yingming Yao
DOI:10.1002/ejoc.201600291
日期:2016.5
Four amidato divalent lanthanide complexes, LnLn[N(TMS)2]THF}2 [n = 1, Ln = Eu (1); n = 2, Ln = Eu (3), Yb (4); HL1 = tBuC6H4CONHC6H3(iPr)2; HL2 = C6H5CONHC6H3(iPr)2] and L3Eu[N(TMS)2]THF}L32Eu(THF)2} (2) [HL3 = ClC6H4CONHC6H3(iPr)2], were synthesized and extensively characterized. This is the first time that the amidato lanthanide amides 1–4 were used to catalyze the reactions of CO2 and 2-aminobenzonitriles
四种酰胺二价镧系元素配合物,LnLn[N(TMS)2]THF}2[n=1,Ln=Eu(1);n = 2, Ln = Eu (3), Yb (4); HL1 = tBuC6H4CONHC6H3(iPr)2;HL2 = C6H5CONHC6H3(iPr)2] 和 L3Eu[N(TMS)2]THF}L32Eu(THF)2} (2) [HL3 = ClC6H4CONHC6H3(iPr)2] 被合成并广泛表征。这是首次使用酰胺基镧系元素酰胺 1-4 在大气压下催化 CO2 和 2-氨基苯甲腈反应形成喹唑啉-2,4(1H,3H)-二酮。所有的配合物都有效地催化了转化,配合物 3 显示出最高的活性。该催化体系具有良好的产率和良好的官能团耐受性。进行了初步研究以研究反应机理。