6278-41-7Relevant academic research and scientific papers
New half-sandwich (η6-p-cymene)ruthenium(II) complexes with benzothiazole hydrazone Schiff base ligand: Synthesis, structural characterization and catalysis in transamidation of carboxamide with primary amines
Vijayapritha, Subbarayan,Viswanathamurthi, Periasamy
, (2020/10/18)
Few half-sandwich (η6-p-cymene) ruthenium(II) complexes supported by benzothiazole hydrazone Schiff bases were synthesized. The new complexes possess the general formulae [Ru(η6-p-cymene)(L)Cl] (1-3) (L = salicyl((2-(benzothiazol-2-yl)hydrazono)methylphenol) (SAL-HBT), 2-((2-(benzothiazol-2-yl)hydrazono)methyl)-6 methoxyphenol) (VAN-HBT) or naphtyl-2-((2-(benzothiazol-2-yl)hydrazono)methyl phenol) (NAP-HBT). All compounds were fully studied by analytical, spectroscopic techniques (IR, NMR) and also by mass spectrometry. The solid state structure of the complex 3 reveals the coordination of p-cymene moieties with ruthenium(II) in a three-legged piano-stool geometry along with benzothiazole hydrazone Schiff base ligand in a monobasic bidentate fashion. The catalytic properties of the complexes were screened in transamidation of primary amide with amines after optimization with respect to solvent, substituents, time and catalyst loading. The results show that the complex 3 is the most efficient catalyst for the transamidation of carboxamides with amines.
Synthesis and structural characterization of facile ruthenium(II) hydrazone complexes: Efficient catalysts in α-alkylation of ketones with primary alcohols via hydrogen auto transfer
Kalaiarasi, Chinnasamy,Murugan, Kaliyappan,Vijayan, Paranthaman,Vijayapritha, Subbarayan,Viswanathamurthi, Periasamy
, (2020/08/06)
As a immersion for development of new complexes, new Ru(II) complexes (1–3) supported by benzothiazole hydrazine Schiff bases of the type [Ru(SAL-HBT)(CO)(AsPh3)2], [Ru(VAN-HBT)(CO)(AsPh3)2] and [Ru(NAP-HBT)(CO)Cl(AsPh3)2] [SAL-HBT = (salicyl((2-(benzothiazol-2yl)hydrazono)methylphenol)), VAN-HBT = 2-((2-(benzothiazol-2-yl)hydrazono)methyl)-6 methoxyphenol) and NAP-HBT = naphtyl-2-((2-(benzothiazol-2-yl)hydrazono)methyl phenol)] were synthesized. Their identities have been established by satisfactory elemental analyses, various spectroscopic techniques (IR, (1H, 13C) NMR) and also mass spectrometry. The ruthenium(II) ion exhibits a hexa coordination with distorted octahedral geometry. In complexes 1 and 2, the ligand coordinated as dianionic tridentate fashion by forming N^N donor five member and N^O donor six member chelate rings. However, in complex 3, the ligand coordinated as monoanionic bidentate fashion by forming N^N donor five-membered ring. The new ruthenium(II) carbonyl complexes were successfully applied as catalysts in α -alkylation of aliphatic and aromatic ketones with alcohols via borrowing hydrogen strategy. Various parameters such as base, solvent, temperature, time and catalyst loading on the catalytic activity were analyzed. From the results, the catalyst 1 was found to be the best catalyst for α-alkylation reaction to obtain excellent yield. The catalytic system has a broad substrate scope, which allows the synthesis of α-alkylated ketones in mild reaction conditions with low catalyst loading under air atmosphere.
Design, synthesis and biological evaluation of thiosemicarbazones, hydrazinobenzothiazoles and arylhydrazones as anticancer agents with a potential to overcome multidrug resistance
Pape, Veronika F.S.,Tóth, Szilárd,Füredi, András,Szebényi, Kornélia,Lovrics, Anna,Szabó, Pál,Wiese, Michael,Szakács, Gergely
, p. 335 - 354 (2016/05/19)
There is a constant need for new therapies against multidrug resistant (MDR) cancer. An attractive strategy is to develop chelators that display significant antitumor activity in multidrug resistant cancer cell lines overexpressing the drug efflux pump P-glycoprotein. In this study we used a panel of sensitive and MDR cancer cell lines to evaluate the toxicity of picolinylidene and salicylidene thiosemicarbazone, arylhydrazone, as well as picolinylidene and salicylidene hydrazino-benzothiazole derivatives. Our results confirm the collateral sensitivity of MDR cells to isatin-β-thiosemicarbazones, and identify several chelator scaffolds with a potential to overcome multidrug resistance. Analysis of structure-activity-relationships within the investigated compound library indicates that NNS and NNN donor chelators show superior toxicity as compared to ONS derivatives regardless of the resistance status of the cells.
Synthesis, spectroscopic, antibacterial and antifungal studies on copper(II) complexes with 2-benzothiazolyl hydrazones
Cǎlinescu, Mirela,Ion, Emilia,Georgescu, Rodica,Negreanu-P?rjol, Ticu?a
experimental part, p. 911 - 919 (2009/12/25)
A series of six complex compounds of Cu(II) with 2-hydroxybenzaldehyde 2-benzothiazolyl hydrazone (H2La) and 2-aminobenzaldehyde 2-benzothiazolyl hydrazone (HLb) have been synthesized and characterized by elemental and thermal analysis, molar conductance determinations, IR, electronic and EPR spectroscopy. According to the IR spectra, the ligands can coordinate in two tautomeric forms through the azomethine and benzothiazole nitrogen atoms and deprotonated hydroxyl group for H2La, or amino group for HLb. Depending of the pH and the metal salt used, the following complex compounds were obtained: [Cu(HLa)Cl(H2O)]·H2O and [Cu(HL a)Br]·3H2O, with monobasic tridentate ligand; [Cu2L2a]·2H2O, with dibasic tridentate ligand; [Cu(HLb)Cl(H2O)]Cl and [Cu(HL b)Br(H2O)]Br with neutral tridentate ligand and [CuL 2b] where the ligand is monobasic bidentate. The bonding parameters calculated from the EPR spectra proved that the metal-ligand bonds are of high covalency. Investigations on antimicrobial activity show that the complexes are moderately active against various Gram positive and Gram negative bacteria and fungi.
