已经对一系列具有叔取代胺的配体的四配位铍(II)配合物的结构进行了计算建模,并使用6-311 ++的轨距包括原子轨道(GIAO)方法确定了其9 Be磁屏蔽值g(2d,p)级别。与极性质子溶剂中的实验值相比,在计算出的9 Be NMR化学位移之间观察到良好的相关性,极性质子溶剂中记录的值则较小。对许多替代复杂结构进行了建模,从而使实验与计算相比有了改进9NMR化学位移表明,在某些情况下,铍原子没有完全包封。几个合成的复合物产生了意想不到的荧光,并检查与所述电子跃迁相关联的所述计算出的分子轨道图表表明,在某些构象锁定赋予刚性来II协调跨越相邻的对齐的芳环允许离域桥接通过成为II。
新型铁螯合剂N,N'-双(2-羟基苯基)乙二胺-N,N'-二乙酸(1),双内酯2,N,N'-双(2-羟基苄基)-2-羟基丙烯-1, 3-二胺-N,N'-二乙酸(3)及其甲酯内酯4和N,N'-双(2-羟基苄基)乙二胺-N,N'-二乙酸的一系列酯(5)用超输血的铁超负荷小鼠模型制备了它们的铁螯合功效和毒性。将生物学活性与使用高输血大鼠获得的结果进行比较。酯化增强了口服铁螯合活性,但也增加了毒性。5的二异丙酯表现出最高的治疗指数。体外测量表明,在pH 7时酯水解的速率。在5 X 10(-4)M铁离子存在下,5的含量增加10(4)倍,这可能解释了酯和内酯作为前药的效用。筛选了其他十七种螯合剂,但没有腹膜内或口服活性。
Oor N-Alkylated derivatives of aminophenols are important synthetic intermediates in organic synthesis. A series of aminophenols were selectively alkylated on their hydroxyl group in good yields via benzaldehyde protection of the amino group, subsequent alkylation, and hydrolysis; or on their amino group via imination and following reduction.
Esters and lactones of phenolic amino carboxylic acids. Prodrugs for iron chelation
作者:Colin G. Pitt、Y. Bao、J. Thompson、M. C. Wani、H. Rosenkrantz、J. Metterville
DOI:10.1021/jm00157a020
日期:1986.7
The new iron chelator N,N'-bis(2-hydroxyphenyl)ethylenediamine-N,N'-diacetic acid (1), its dilactone 2, N,N'-bis(2-hydroxybenzyl)-2-hydroxypropylene-1,3-diamine-N,N'- diacetic acid (3), and its methyl ester lactone 4 and a series of esters of N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid (5) were prepared and their iron chelating efficacy and toxicity determined by using the hypertransfused
新型铁螯合剂N,N'-双(2-羟基苯基)乙二胺-N,N'-二乙酸(1),双内酯2,N,N'-双(2-羟基苄基)-2-羟基丙烯-1, 3-二胺-N,N'-二乙酸(3)及其甲酯内酯4和N,N'-双(2-羟基苄基)乙二胺-N,N'-二乙酸的一系列酯(5)用超输血的铁超负荷小鼠模型制备了它们的铁螯合功效和毒性。将生物学活性与使用高输血大鼠获得的结果进行比较。酯化增强了口服铁螯合活性,但也增加了毒性。5的二异丙酯表现出最高的治疗指数。体外测量表明,在pH 7时酯水解的速率。在5 X 10(-4)M铁离子存在下,5的含量增加10(4)倍,这可能解释了酯和内酯作为前药的效用。筛选了其他十七种螯合剂,但没有腹膜内或口服活性。
Novel dinuclear manganese(III) complexes with bi- or tridentate and bridging tetradentate Schiff base ligands: preparation, properties and catalase-like function
However, the results suggested that the two manganese(III) ions in these complexes are bridged by one sal-m-xylylene or salpentn ligand to form a dinuclearcomplex, and each complex has an arrangement similar to that of the mononuclear complex 2. The reactivities of these manganese(III) complexes toward H2O2 have been found that the dinuclearcomplexes 4a–e, 5a, and 5b can decompose excess amounts
A Facile Reduction Procedure for<i>N</i>,<i>N</i>′‐<i>bis</i>[5‐Substituted Salicylidene]‐<i>m</i>/<i>p</i>‐phenylenediamines with Sodium Borohydride–Silica Gel System
Abstract An easy approach involving sodiumborohydride/silica gel system offers a fast method of reduction for N,N′‐bis[5‐substituted salicylidene] m/p‐phenylenediamines to the corresponding amines with excellent yield. The observed formation of boron chelates in the borohydridereduction of some related Schiff bases has been avoided in this method.
and in the order of para (291 °C) > meta (270 °C) > ortho (266 °C). Even though meta-PBZ2 displayed an earlier degradation with Td10 of 358 °C as compared to para and ortho (Td10: 373 °C) due to aza-cyclic rings, the main backbone degradation was observed to be coinciding in all PBZ2s at 417 °C with a char yield of 57% at 600 °C. Thus, changing position of oxazine ring to “meta” in the backbone is