SYNTHESIS OF IMIDAZO[1,2-a]PYRAZIN-4-IUM SALTS FOR THE SYNTHESIS OF 1,4,7-TRIAZACYCLONONANE (TACN) AND N- AND/OR C-FUNCTIONALIZED DERIVATIVES THEREOF
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)
公开号:US20140142298A1
公开(公告)日:2014-05-22
The present invention embodiments relate to a compound with formula (V′)
The invention also relates in certain embodiments to the synthesis method for compound (V′) and its use for the preparation of 1,4,7-triazacyclononane (tacn) and N- and/or C-functionalized derivatives thereof, particularly compounds with formula (I)
The invention also relates in certain embodiments to metallic complexes comprising a ligand with formula (I) and a metal and their use for imaging.
Significant relaxivity gap between a low-spin and a high-spin iron(<scp>ii</scp>) complex of structural similarity: an attractive off–on system for the potential design of responsive MRI probes
similar iron complexes in the oxidation state II that exist in a low-spin and a high-spin electronic spin state in aqueous media, respectively. The low-spin, diamagnetic complex (LS, 1) is mute in MRI while the high-spin, paramagnetic complex (HS, 2) generates considerable contrast in MRI. These results demonstrate that iron(II) complexes, hitherto neglected for contrast enhancement in MRI, have potential
我们已经确定了一对在氧化态II中结构相似的铁配合物,它们分别在水性介质中以低自旋和高自旋电子自旋态存在。低自旋抗磁性复合物(最小二乘,1)在MRI中是静音的,而高旋转顺磁性复合物(HS,2)在MRI中产生相当大的对比度。这些结果表明,迄今为止被忽略以增强MRI对比度的铁(II)配合物具有设计MRI探针的潜力,该MRI探针在目标生化活性的影响下会从一种状态传递到另一种状态,因此处于关闭状态–on模式。在300 MHz(质子 7 T场强时的共振频率)和 磷酸盐缓冲液,我们发现纵向弛豫率(r 1)为1.29 mM -1 s -1对于2,鉴于中心金属原子的未成对电子的差异(Fe II为4 ; Gd III为7 )非常接近与of(III)–DOTA(2.44 mM -1 s -1)的商业化MRI造影剂。由于g络合物始终是顺磁性的,因此无法在MRI中静音,因此本文介绍的基于Fe(II)的系统提供了开发响应性MRI探针的替代策略。
Pyridyl-Based Pentadentate Ligands: Base-Catalyzed Hydrolysis of <i>a</i><i>sym</i>-[Co(dmptacn)Cl]<sup>2+</sup>
作者:W. Gregory Jackson、Alistair J. Dickie、Rajumati Bhula、Josephine A. McKeon、Leone Spiccia、Suzanne J. Brudenell、David C. R. Hockless、Anthony C. Willis
DOI:10.1021/ic040041m
日期:2004.10.1
perchlorate salt. The kinetics of base-catalyzed hydrolysis establishes the usual [OH(-)] dependence (k(OH) = 0.040 M(-1) s(-1), 25 degrees C, I = 1.0 M, NaCl), but D-exchange experiments reveal that substantial if not complete reaction proceeds via the new pseudoaminate mechanism, i.e., via deprotonation at an alpha-CH(2) center rather than the NH. The significant kinetic isotopeeffect (k(H)/k(D) = 2.1)
The Reversible and Stereoselective N- to C-bonded Rearrangement of Tris(2-pyridylmethyl)-1,4,7-triazacyclononanecobalt(III)
作者:W. Gregory Jackson、Josephine A. McKeon、David C. R. Hockless、Anthony C. Willis
DOI:10.1021/ic051997f
日期:2006.5.1
contraction. The carbanion is part of a strained four-membered ring. The kinetics are reported for the N- to C-rearrangement, shown to be retentive for the optically resolved (+)-[Co(tmptacn)]3+ reactant, and also the kinetics for a competitive and somewhat faster base-catalyzed racemization reaction of this complex. The reaction is completely but very slowly reversed in acid, also with retention, and
六胺钴(III)络合物[Co(tmptacn)] 3+(tmptacn = 1,4,7-三(2'-吡啶甲基)-1,4,7-三氮杂环壬烷)经历新型碱催化的N-到C-键重排,其中tacn氮被α-碳置换,该α-碳去质子化并与金属离子结合成碳负离子。X射线结构确定了区域选择性和立体选择性(100%)成型产品的构型。该反应涉及环的膨胀和环的收缩。碳负离子是应变四元环的一部分。报道了N-到C重排的动力学,显示出对光学拆分的(+)-[Co(tmptacn)] 3+反应物具有保持力,并且还具有竞争性,并且在一定程度上加快了碱催化的消旋反应的动力学。这个复杂的。反应在酸中完全但非常缓慢地逆转,同样具有保留性,并且在D2O / D +中,将1:1 D掺入两组不等量的tacn碳中。广泛的1D和2D NMR研究确定了机理细节,并提出了正向和反向反应的替代机理。在中性溶液中,存在一个竞争性的氧化反应,用于C-至N键
Synthesis and superoxide dismutase activity of novel iron complexes
with no easily substituted ligand. On the other hand, other Fe(II) complexes with unsaturated coordination or an easily substituted ligand had high SOD activity (IC50=0.4–20 μM). The results indicate that the substitution reaction of a ligand with superoxide or the coordination of superoxide is essential for Fe(II)TPEN analogue complexes to have SOD activity. Moreover, we examined the effect of steric