Characterization of a Paramagnetic Mononuclear Nonheme Iron-Superoxo Complex
摘要:
O-2 bubbling into a THF solution of Fe-II(BDPP) (1) at -80 degrees C generates a reversible bright yellow adduct 2. Characterization by resonance Raman and Mossbauer spectroscopy provides complementary insights into the nature of 2. The former shows a resonance-enhanced vibration at 1125 cm(-1), which can be assigned to the v(O-O) of a bound superoxide, while the latter reveals the presence of a high-spin iron(III) center that is exchange-coupled to the superoxo ligand, like the Fe-III-O-2(-) pair found for the O-2 adduct of 4-nitrocatechol-bound homoprotocatechuate 2,3-dioxygenase. Lastly, 2 oxidizes dihydroanthracene to anthracene, supporting the notion that Fe-III-O-2(-) species can carry out H atom abstraction from a C-H bond to initiate the 4-electron oxidation of substrates proposed for some nonheme iron enzymes.
Enantiospecific synthesis of pyridinylmethyl pyrrolidinemethanols and catalytic asymmetric borane reduction of prochiral ketones
摘要:
Three chiral pyridinylmethyl pyrrolidinemethanol derivatives have been synthesized from N-alkylation of (S)-alpha,alpha-diphenyl-2-pyrrolidinemethanol and N-carbonylation Of L-proline methyl ester. The catalytic asymmetric borane reduction of prochiral ketones was examined in the presence of chiral oxazaborolidine catalysts prepared in situ from chiral pyridinylmethyl pyrrolidinemethanol derivatives. The corresponding chiral secondary alcohols were obtained with good to excellent enantiomeric excesses (up to 98% ee) using (S)-2-(diphenylmethanol)-1-(2-pyridylmethyl)pyrrolidine I in THF at reflux and moderate to good enantiomeric excesses using C-2-symmetric compound 2 (up to 86% ee) in THE. (C) 2003 Elsevier Ltd. All rights reserved.
NOVEL NI COMPLEX AND ITS DERIVATIVES, PRODUCING METHOD, AND THE USE THEREOF AS AN ANTIOXIDANT
申请人:Lee Way-Zen
公开号:US20130317224A1
公开(公告)日:2013-11-28
The present invention relates to a novel nickel complex and its derivatives, which mimic the active site of Ni-containing superoxide dismutase (NiSOD). The five-coordinate Ni(II) and Ni(III) complexes or their derivatives, and six-coordinate derivatives have the following structures of formula (I) and (II):
The nickel complexes and their derivatives of the invention act as anti-oxidants or free radical scavengers. The invented nickel complexes can be used in the preparation of medicines, health foods or cosmetics for human, animals and plants, or can be used in environmental or soil protection.
Bubbling O2 into a THF solution of CoII(BDPP) (1) at -90 °C generates an O2 adduct, Co(BDPP)(O2) (3). The resonance Raman and EPR investigations reveal that 3 contains a low spin cobalt(III) ion bound to a superoxoligand. Significantly, at -90 °C, 3 can react with 2,2,6,6-tetramethyl-1-hydroxypiperidine (TEMPOH) to form a structurally characterized cobalt(III)-hydroperoxo complex, CoIII(BDPP)(OOH) (4)
Mononuclear Manganese(III) Superoxo Complexes: Synthesis, Characterization, and Reactivity
作者:Yen-Hao Lin、Hanna Hinrika Cramer、Maurice van Gastel、Yi-Hsuan Tsai、Chi-Yi Chu、Ting-Shen Kuo、I-Ren Lee、Shengfa Ye、Eckhard Bill、Way-Zen Lee
DOI:10.1021/acs.inorgchem.9b00767
日期:2019.8.5
that both complexes contain a high-spin MnIII center (SMn = 2) antiferromagnetically coupled to a superoxo radical ligand (SOO• = 1/2), yielding an overall S = 3/2 ground state. Complexes 2 and 2′ were shown to be capable of abstracting a H atom from 2,2,6,6-tetramethyl-1-hydroxypiperidine (TEMPO-H) to form MnIII–hydroperoxo species, Mn(BDPP)(OOH) (5) and Mn(BDPBrP)(OOH) (5′). Complexes 5 and 5′ can
Mononuclear diastereopure non-heme Fe(II) complexes of pentadentate ligands with pyrrolidinyl moieties: Structural studies, and alkene and sulfide oxidation
作者:Silvia Gosiewska、Martin Lutz、Anthony L. Spek、Robertus J.M. Klein Gebbink
DOI:10.1016/j.ica.2006.08.009
日期:2007.1
CANCER TREATMENT METHOD USING Ni-SOD MIMIC COMPOUND
申请人:NATIONAL CHIAO TUNG UNIVERSITY
公开号:US20190350939A1
公开(公告)日:2019-11-21
A cancer treatment method using a Ni-SOD mimic compound is provided, which includes administrating the Ni-SOD compound to a cancer cell of a cancer. The structure of the Ni-SOD mimic compound is represented as follows:
wherein R
1
represents H or A-R′; A represents a bond, O or N; L represents acetonitrile, water, or t-butyl isocyanate; R′ represents H, unsubstituted or substituted alkyl, polyalkoxy, polydimethylsiloxane, polyurethane or other polymer materials or amino acid groups; R
2
represents unsubstituted or substituted alkyl, alkoxy, siloxy, amino, alkylamine or hydrocarbyl groups; R
3
represents unsubstituted or substituted amino, alkylamine, oxyalkylamine groups or magnetic nanoparticles attached oxyalkylamine. Ni is bivalent or trivalent.