Catalytic Cyclophanes. Part VIII. Cytochrome P-450 activity of a porphyrin-bridged cyclophane
作者:David R. Benson、Robert Valentekovich、Suk-Wah Tam、Fran�ois Diederich
DOI:10.1002/hlca.19930760519
日期:1993.8.11
porphyrin-cyclophane 1 having a porphyrin attached by two straps to an apolar cyclophane binding site was prepared. Upon metallation, the ZnII and FeIII derivatives 2 and 3, respectively, were obtained in good yields. Treatment of 3 with base yielded the μ-oxo dimer 4 in which the two oxo-bridged porphyrins moieties are both capped by cyclophane binding sites. All compounds 1–4 are freely soluble in protic solvents
下列已知的合成方法中,卟啉环芳1具有附着的卟啉通过两个带以制备非极性环芳结合位点。在金属化时,分别以良好的产率获得了Zn II和Fe III衍生物2和3。用碱处理3产生μ-氧代二聚体4,其中两个氧代桥连的卟啉部分均被环烷结合位点封端。所有化合物1-4可自由溶于质子溶剂,例如MeOH和CF 3 CH 2 OH以及Fe III衍生物3和4在这些质子环境中是活跃的细胞色素P-450模仿物。观察到在醇类溶剂中1和3对多环芳烃的强包合络合物,并通过1 H-NMR和UV / VIS滴定进行定量。ena以“赤道”取向结合,其反应性1,2-双键位于卟啉中心附近,而菲则“轴向”结合远离卟啉的反应性9,10-双键。底物结合并没有显着改变3的还原电位。以未结合形式,通过ESR和1 H-NMR发现卟啉3中的Fe III中心更倾向于高自旋态(S = 5.2)。在CF中3 CH 2 OH,使用碘基苯作为O转移剂,Fe