Intramolecularly alkylated salen complexes: new models for coenzyme B12 with a cobalt-to-ligand carbon bridge
作者:Bert van Arkel、Juul L. van der Baan、Sijbe Balt、Friedrich Bickelhaupt、Martinus W. G. de Bolster、Irene E. Kingma、Gerhard W. Klumpp、Jan W. E. Moos、Anthony L. Spek
DOI:10.1039/p19930003023
日期:——
The synthesis of H2salen 2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenol} derived models 1 for coenzyme B12 with a carbon bridge between the ligand and cobalt has been accomplished by condensation of salicylaldehyde and ω-substituted 1,2-diamines 8 followed by complexation with CoII, reduction to CoI complexes, and intramolecular alkylation. The structures of intramolecularly alkylated Co(salen)
H 2 salen 2,2'-[乙烷-1,2-二基双(亚硝基甲基二炔)]二酚}的衍生模型1的合成是通过水杨醛和水合缩合完成的,辅酶B 12具有在配体和钴之间的碳桥。 ω-取代的1,2-二胺8,然后与Co II络合,还原为Co I络合物,并进行分子内烷基化。分子内烷基化的Co(salen)配合物具有三个1b和四个亚甲基1c的桥的结构已通过NMR光谱法进行了研究,并通过X射线晶体学测定。