19312-05-1Relevant articles and documents
Insights into the antiproliferative mechanism of (C^N)-chelated half-sandwich iridium complexes
Ramos, Robin,Zimbron, Jérémy M.,Thorimbert, Serge,Chamoreau, Lise-Marie,Munier, Annie,Botuha, Candice,Karaiskou, Anthi,Salmain, Michèle,Sobczak-Thépot, Jo?lle
supporting information, p. 17635 - 17641 (2020/12/30)
Transition metal-based anticancer compounds, as an alternative to platinum derivatives, are raising scientific interest as they may present distinct although poorly understood mechanisms of action. We used a structure-activity relationship-based methodology to investigate the chemical and biological features of a series of ten (C^N)-chelated half-sandwich iridiumIII complexes of the general formula [IrCp?(phox)Cl], where (phox) is a 2-phenyloxazoline ligand forming a 5-membered metallacycle. This series of compounds undergoes a fast exchange of their chlorido ligand once solubilised in DMSO. They were cytotoxic to HeLa cells with IC50 values in the micromolar range and induced a rapid activation of caspase-3, an apoptosis marker. In vitro, the oxidative power of all the complexes towards NADH was highlighted but only the complexes bearing substituents on the oxazoline ring were able to produce H2O2 at the micromolar range. However, we demonstrated using a powerful HyPer protein redox sensor-based flow cytometry assay that most complexes rapidly raised intracellular levels of H2O2. Hence, this study shows that oxidative stress can partly explain the cytotoxicity of these complexes on the HeLa cell line and gives a first entry to their mechanism of action. This journal is
Directed β C-H Amination of Alcohols via Radical Relay Chaperones
Wappes, Ethan A.,Nakafuku, Kohki M.,Nagib, David A.
, p. 10204 - 10207 (2017/08/10)
A radical-mediated strategy for β C-H amination of alcohols has been developed. This approach employs a radical relay chaperone, which serves as a traceless director that facilitates selective C-H functionalization via 1,5-hydrogen atom transfer (HAT) and enables net incorporation of ammonia at the β carbon of alcohols. The chaperones presented herein enable direct access to imidate radicals, allowing their first use for H atom abstraction. A streamlined protocol enables rapid conversion of alcohols to their β-amino analogs (via in situ conversion of alcohols to imidates, directed C-H amination, and hydrolysis to NH2). Mechanistic experiments indicate HAT is rate-limiting, whereas intramolecular amination is product- and stereo-determining.
Synthesis, crystal structures and catalytic activities of new palladium(II)–bis(oxazoline) complexes
Ibrahim, Mansur B.,Malik, Imran,Shakil Hussain,Fazal, Atif,Fettouhi, Mohammed,El Ali, Bassam
, p. 739 - 749 (2016/09/13)
Palladium–bis(oxazoline) complexes (Pd-BOX-A and Pd-BOX-B) were synthesized and characterized by 1H, 13C NMR, IR and elemental analysis. The molecular structures of the complexes were confirmed by single-crystal X-ray analysis. In both cases, the palladium center is coordinated by the nitrogen atoms of the two oxazoline rings and two chloride ligands in a distorted square planar geometry. Despite the fact that the bis(oxazoline) ligand is achiral, the asymmetrical substitution on the phenyl spacer and the rigid backbone of the complex Pd-BOX-A induce inherent chirality and the compound crystallizes as a racemic mixture. Both complexes were found to be highly effective catalysts for Suzuki–Miyaura, Mizoroki–Heck and Sonogashira cross-coupling reactions. They also show excellent catalytic activities toward carbonylative coupling reactions.
Palladium-catalyzed electrophilic C–H fluorination of arenes using oxazoline as a removable directing group
Gutierrez, David A.,Lee, Wan-Chen Cindy,Shen, Yuning,Li, Jie Jack
, p. 5372 - 5376 (2016/11/11)
Dimethyloxazoline was rationally designed to act as a removable ortho-directing group (DG) for the palladium-catalyzed C–H electrophilic fluorination of arenes. Using NFSI as the fluorinating agent, and Pd(II), Ag(I) catalytic system, electrophilic C(sp2–H) ortho-fluorination took place on a variety of aryl substrates to afford the corresponding mono- and di-fluorinated products.
AROMATIC COMPOUND
-
Paragraph 0935; 0936, (2016/05/19)
Provided is a novel aromatic ring compound having a GPR40 agonist activity and a GLP-1 secretagogue action. A compound represented by the formula: wherein each symbol is as described in the DESCRIPTION, or a salt thereof has a GPR40 agonist activity and a GLP-1 secretagogue action, is useful for the prophylaxis or treatment of cancer, obesity, diabetes, hypertension, hyperlipidemia, cardiac failure, diabetic complications, metabolic syndrome, sarcopenia and the like, and affords superior efficacy.
Simple and convenient access to α,α,α-trisubstituted amides by double addition of Grignard reagents to acyl cyanohydrins
Boukattaya, Fatma,Stanovych, Andrii,Setzer, Paul,Abid, Souhir,Ammar, Houcine,Pearson-Long, Morwenna S. M.,Bertus, Philippe
supporting information; experimental part, p. 8655 - 8657 (2012/10/08)
The double addition of Grignard (alkyl, aryl, alkenyl, alkynyl) reagents to acyl cyanohydrins was performed under unusually smooth conditions with a concomitant O-N acyl transfer, providing a very simple and general access to α,α,α-trisubstituted amides.
Highly stereoselective Ru(ii)-Pheox catalyzed asymmetric cyclopropanation of terminal olefins with succinimidyl diazoacetate
Chanthamath, Soda,Phomkeona, Kesiny,Shibatomi, Kazutaka,Iwasa, Seiji
supporting information; experimental part, p. 7750 - 7752 (2012/09/21)
The Ru(ii)-Pheox complex is an efficient catalyst for the intermolecular cyclopropanation of various terminal olefins with succinimidyl diazoacetate. This catalytic system can perform under mild conditions, and the desired cyclopropane products are obtain
Ru(II)-Pheox catalyzed N-H insertion reaction of diazoacetamides: Synthesis of N-substituted α-aminoamides
Chanthamath, Soda,Thongjareun, Songkharm,Shibatomi, Kazutaka,Iwasa, Seiji
supporting information; experimental part, p. 4862 - 4865 (2012/09/08)
An efficient protocol for the preparation of α-aminoamides was developed via the Ru(II)-dm-Pheox catalyzed N-H insertion reaction of various diazoacetamides with several amines, including aniline. This catalytic N-H insertion reaction was also applied to the synthesis of 2-(2-methylquinolin-4- ylamino)-N-phenylacetamide, a potential antileishmanial agent.
Remote C-H bond functionalization reveals the distance-dependent isotope effect
Li, Jiao-Jie,Giri, Ramesh,Yu, Jin-Quan
, p. 6979 - 6987 (2008/09/21)
Iodination of remote aryl C-H bonds has been achieved using palladium acetate as the catalyst and iodoacetate (IOAc) as the oxidant. Systematic kinetic isotope studies imply a mechanistic regime shift as the number of bonds separating the directing heteroatom and the target C-H bond increases. Both isotope and electronic effects observed in remote C-H bond activation are consistent with an electrophilic palladation pathway in which the initial palladation is slower than the C-H bond cleavage.
Potential modes of interaction of 9-aminomethyl-9,10-dihydroanthracene (AMDA) derivatives with the 5-HT2A receptor: A ligand structure-affinity relationship, receptor mutagenesis and receptor modeling investigation
Runyon, Scott P.,Mosier, Philip D.,Roth, Bryan L.,Glennon, Richard A.,Westkaemper, Richard B.
experimental part, p. 6808 - 6828 (2009/10/17)
The effects of 3-position substitution of 9-aminomethy 1-9,10- dihydroanthracene (AMDA) on 5-HT2A receptor affinity were determined and compared to a parallel series of DOB-like 1-(2,5-dimethoxyphenyl)-2- aminopropanes substituted at the 4-position. The results were interpreted within the context of 5-HT2A receptor models that suggest that members of the DOB-like series can bind to the receptor in two distinct modes that correlate with the compounds' functional activity. Automated ligand docking and molecular dynamics suggest that all of the AMDA derivatives, the parent of which is a 5-HT2A antagonist, bind in a fashion analogous to that for the sterically demanding antagonist DOB-like compounds. The failure of the F340 6.52L mutation to adversely affect the affinity of AMDA and the 3-bromo derivative is consistent with the proposed modes of orientation. Evaluation of ligand-receptor complex models suggest that a valine/threonine exchange between the 5-HT2A and D2 receptors may be the origin of selectivity for AMDA and two substituted derivatives.
