Investigation of the Coordination Interactions of S-(Pyridin-2-ylmethyl)-<scp>l</scp>-Cysteine Ligands with M(CO)<sub>3</sub><sup>+</sup> (M = Re, <sup>99m</sup>Tc)
作者:Haiyang He、Jennifer E. Morley、Brendan Twamley、Ryan H. Groeneman、Dejan-Krešimir Buč̌ar、Leonard R. MacGillivray、Paul D. Benny
DOI:10.1021/ic901159r
日期:2009.11.16
Development of new ligands for fac-M(OH2)3(CO)3+ (M = Re, 99mTc) led the investigation with S-(pyridin-2-ylmethyl)-l-cysteine, 1. The ligand 1 has potential to coordinate with the metal through three different tridentate modes: tripodal through cysteine (O,N,S) and two linear involving the S-pyridyl and cysteine (O,S,NPy, N,S,NPy). From the reaction with 1, two species were observed in the 1H NMR,
fac -M(OH 2)3(CO)3 +(M = Re,99m Tc)的新配体的开发带动了S-(吡啶-2-基甲基)-1-半胱氨酸1的研究。配体1具有通过三种不同的三齿模式与金属配位的潜力:三脚架通过半胱氨酸(O,N,S)和两个涉及S-吡啶基和半胱氨酸的线性(O,S,N Py,N,S,N Py)。从与反应1中,观察到两个种类1 H NMR,其中初级产物是线性FAC -Re(N,S,N PY -1)(CO)3 +,2a,复杂的。为了确定次要产物的配位模式,从S-(吡啶-2-基甲基)-Boc - 1-半胱氨酸甲酯制备了1的官能化类似物3,在C末端带有正交保护基(甲酯) S-(吡啶-2-基甲基)-1-半胱氨酸甲酯4或N-末端(Boc)在S-(吡啶-2-基甲基)-Boc- 1-半胱氨酸6中,专门指导配位模式的FAC -M(H 2 O)3(CO)3 +要么N,S,N PY或O,S,N Py。观察到两个非对映异构体[