New N<sub>3</sub>S Donor Ligand Small Peptide Analogues of the <i>N</i>-Mercaptoacetyl-glycylglycylglycine Ligand in the Clinically Used Tc-99m Renal Imaging Agent: Evidence for Unusual Amide Oxygen Coordination by Two New Ligands
作者:Malgorzata Lipowska、Lory Hansen、Xiaolong Xu、Patricia A. Marzilli、Andrew Taylor,、Luigi G. Marzilli
DOI:10.1021/ic011325z
日期:2002.6.1
the basal plane via N(3)S. In the other complexes, the quadridentate ligand has N(2)OS ligation, with the carbonyl oxygen of the glycyl amide group coordinated trans to the oxo ligand. This unusual ligation mode, which is facilitated by the preferred endo configuration of the ligated glycyl sp(3) N, leaves a vacant basal coordination site. In 11, the chloro ligand completes the equatorial plane, whereas
三个新的X射线结构表征的Re(V)O配合物,ReO(MEG(3)H(2))(10),ReClO(MAEG(2)H(3))(11)和[ReO(MECG( 2)H(2))](2)(12)由三种新配体的保护形式制备,巯基乙基-甘氨酰甘氨酰甘氨酸(MEG(3)H(5)),巯基乙酰胺-乙基甘氨酰甘氨酸(MAEG(2)H (5))和巯基乙基-氨基甲酰基甲基-甘氨酰甘氨酸(MECG(2)H(5))。(H的下标表示可解离的质子数。)巯基乙酰基三甘氨酸(MAG(3)H(5))是临床上使用的Tc-99m肾脏显像剂的配体前体。与MAG(3)H(5)中一样,新的潜在N(3)S供体配体具有一个甘氨酸甘氨酸羧基端,但是仲胺(sp(3)N)取代了MAG(3(S)N)的一个酰胺(sp(2)N)。 3)H(5)。ReO(MEG(3)H(2))(10)是典型的五坐标伪正方形-金字塔形络合物,在顶点具有oxo配体,在基端配位有