Eight-membered-ring diaminocarbenes bearing naphthalene moiety in the backbone: DFT studies, synthesis of amidinium salts, generation of free carbene, metal complexes, and solvent-free copper catalyzed azide–alkyne cycloaddition (CuAAC) reaction
作者:Gleb A. Chesnokov、Maxim A. Topchiy、Pavel B. Dzhevakov、Pavel S. Gribanov、Aleksandr A. Tukov、Victor N. Khrustalev、Andrey F. Asachenko、Mikhail S. Nechaev
DOI:10.1039/c6dt04484k
日期:——
eight-membered ring N-heterocyclic carbene (NHC) bearing a rigid naphthalene moiety in the backbone is reported for the first time. Stereoelectronic properties of 4,5-dihydro-1H-naphtho[1,8-ef][1,3]diazocin-3(2H)-ylidene (NaphtDHD) and smaller ring NHCs were theoretically studied at the DFT level. Amidinium salts were prepared from corresponding amidines and dibromides. Free carbene NaphtDHD-Dipp (Dipp
首次报道了在骨架中带有刚性萘部分的新型八元环N-杂环卡宾(NHC)。理论上在DFT水平上研究了4,5-二氢-1 H-萘[1,8- ef ] [1,3]二唑-3(2 H)-亚烷基(NaphtDHD)和较小的环NHC的立体电子性质。由相应的salts和二溴化物制备盐。通过用LiHMDS处理相应的盐,在溶液中生成了游离的卡宾NaphtDHD-Dipp(Dipp = 2,6-二异丙基苯基)。它在低温下在溶液中稳定,而在室温下则迅速分解。银(I)和铜(I合成了复合物,并在固态下对其结构进行了表征。铜(I)络合物[(NaphtDHD-Mes)CuBr](Mes =甲基1,2,4,6-三甲基苯基)在炔烃-叠氮化物环加成(CuAAC)反应中在无溶剂条件下表现出高催化活性。