Synthesis and properties of aza analogs of merocyanine dyes based on N-substituted 2- and 4-aminopyridinium salts
作者:I. A. Borisova、A. A. Zubarev、L. A. Rodinovskaya、A. M. Shestopalov
DOI:10.1007/s11172-018-2054-2
日期:2018.1
A series of aza analogs of the merocyanine dyes based on 1-N-alkyl-2- and 1-N-alkyl-4-aminopyridinium salts and ethoxymethylidenemalononitrile was synthesized. Their physico-chemical properties were studied.
A series of 4-amino-1-alkyl pyridinium bromide salts (1-10) were synthesized and antimicrobial activity was evaluated by disc diffusion as well as broth macro-dilution method. 4-Amino-1-hexadecylpyridinium bromide (10) which showed good inhibition against Candida albicans and C. glabrata also displayed good germ tube inhibition against C. albicans. Compound 8 shows very low haemolytic activity against human red blood cells. Compound 10 exhibits excellent antibacterial activity against Escherichia coli and Staphylococcus aureus. Inhibition of phospholipase enzyme secretion was also observed against compound 8 to find the possible mode of action.
Pyridinylidenaminophosphines: Facile Access to Highly Electron‐Rich Phosphines
作者:Philipp Rotering、Lukas F. B. Wilm、Janina A. Werra、Fabian Dielmann
DOI:10.1002/chem.201904621
日期:2020.1.7
report the synthesis and properties of a series of phosphines with 1-alkylpyridin-4-ylidenamino and 1-alkylpyridin-2-ylidenamino substituents that are accessible in a very short and scalable route starting from commercially available aminopyridines and chlorophosphines. The determination of the Tolman electronic parameter (TEP) value reveals that the electron donor ability can be tuned by the substituent
富电子叔膦是化学合成中有价值的物质。然而,它们作为催化配体和化学计量反应试剂的广泛应用往往因其昂贵的合成而受到限制。在此,我们报道了一系列具有 1-烷基吡啶-4-亚基氨基和 1-烷基吡啶-2-亚基氨基取代基的膦的合成和性质,这些膦可以从市售氨基吡啶和氯膦开始,以非常短且可扩展的路线获得。托尔曼电子参数(TEP)值的测定表明,电子给体能力可以通过氨基吡啶骨架上的取代基模式来调节,并且可以超过常见的烷基膦和N-杂环卡宾。新膦在膦介导的转化中作为强亲核试剂的潜力通过与 CO2 和 CS2 形成路易斯碱加合物得到证明。此外,还探索了新型膦对 CuI 、 AuI 和 PdII 金属中心的配位化学,并描述了从空气稳定的鏻盐开始将最基本的膦引入金属络合物的简便程序。
Nucleophilic Activation of Sulfur Hexafluoride: Metal-Free, Selective Degradation by Phosphines
sulfides and difluorophosphoranes or in the selective conversion of SF6 into a bench‐stable, crystalline salt containing the SF5− anion. Quantum chemical calculations reveal a nucleophilicsubstitution mechanism (SN2) for the initial fluorine abstraction from SF6 by the phosphine. Furthermore, a scalable one‐pot procedure for the complete decomposition of SF6 into solid, nonvolatile products is presented