Design, Synthesis, and Structure−Activity Relationships of Haloenol Lactones: Site-Directed and Isozyme-Selective Glutathione S-Transferase Inhibitors
摘要:
Overexpression of glutathione S-transferase (GST), particularly the GST-pi isozyme, has been proposed to be one of the biochemical mechanisms responsible for drug resistance in cancer chemotherapy, and inhibition of overexpressed GST has been suggested as an approach to combat GST-induced drug resistance. 3-Cinnamyl-5(E)-bromomethylidenetetrahydro-2-furanone (1a), a lead compound of site-directed GST-pi inactivator, has been shown to potentiate the cytotoxic effect of cisplatin on tumor cells. As an initial step to develop more potent and more selective haloenol lactone inactivators of GST-pi, we examined the relationship between the chemical structures of haloenol lactone derivatives and their GST inhibitory activity. A total of 16 haloenol lactone derivatives were synthesized to probe the effects of (1) halogen electronegativity, (2) electron density of aromatic rings, (3) molecular size and rigidity, (4) lipophilicity, and (5) aromaticity on the potency of GST-pi inactivation. The inhibitory potency of each compound was determined by time-dependent inhibition tests, and recombinant human GST-pi was used to determine their inhibitory activity. Our structure-activity relationship studies demonstrated that (1) reactivity of the halide leaving group plays a weak role in GST inactivation by the haloenol lactones, (2) aromatic electron density may have some influence on the potency of GST inactivation, (3) high rigidity likely disfavors enzyme inhibition, (4) lipophilicity is inversely proportional to enzyme inactivation, and (5) an unsaturated system may be important for enzyme inhibition. This work facilitated understanding of the interaction of GST-pi with haloenol lactone derivatives as site-directed and isozyme-selective inactivators, possibly potentiating cancer chemotherapy.
Palladium(II) catalyzed cyclization of alkynoic acids
作者:Claude Lambert、Kiitiro Utimoto、Hitosi Nozaki
DOI:10.1016/s0040-4039(01)81594-x
日期:——
Under the catalytic action of palladium(II) in the presence of triethylamine, 3-, 4-, and 5-alkynoic acids afford 3-buten-4-olides, 4-penten-4-olides, and 5-hexen-5-olide, respectively, in good to excellent yields.
nucleotide was identified to be the first highly specific inhibitor for rat recombinant α2,3-(N)-sialyltransferase (α2,3ST, IC50 = 8.2 μM), while this compound was proved to become a favorable substrate for rat recombinant α2,6-(N)-sialyltransferase (α2,6ST, Km = 125 μM). Versatility of this strategy was demonstrated by identification of two selective inhibitors for human recombinant α1,3-fucosyltransferase
我们描述了一种标准化的方法,用于通过高通量定量MALDI-TOFMS筛选集中的化合物库来搜索糖基转移酶的有效和选择性抑制剂,该化合物由所需的叠氮基糖核苷酸与各种炔烃进行1,3-偶极环加成而构建。将具有稳定同位素的氨氧基官能化试剂与寡糖缀合,以提供糖肽作为具有增强的离子敏感性的受体底物。新底物的电离效能增强,可在糖基供体底物存在的情况下,基于MALDI-TOFMS进行酶促糖基化的简便分析和定量分析。一种非天然的合成糖核苷酸被确定为大鼠重组α2,3-(N)-唾液酸转移酶(α2,3ST,IC的第一个高度特异性抑制剂50 = 8.2μM),而该化合物被证明是大鼠重组α2,6-(N)-唾液酸转移酶(α2,6ST,K m = 125μM)的有利底物。鉴定两种重组人重组α1,3-岩藻糖基转移酶V(α1,3-FucT,K i = 293 nM)和α1,6-岩藻糖基转移酶VIII(α1,6-FucT,K i
[EN] MODIFIED ALGINATES FOR ANTI-FIBROTIC MATERIALS AND APPLICATIONS<br/>[FR] ALGINATES MODIFIÉS POUR MATÉRIAUX ANTI-FIBROTIQUES ET APPLICATIONS ASSOCIÉES
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2017075631A1
公开(公告)日:2017-05-04
Covalently modified alginate polymers, possessing enhanced biocompatibility and tailored physiochemical properties, as well as methods of making and use thereof, are disclosed herein. The covalently modified alginates are useful as a matrix for coating of any material where reduced fibrosis is desired, such as encapsulated cells for transplantation and medical devices implanted or used in the body.
Gold(I)-Catalyzed One-Pot Tandem Coupling/Cyclization: An Efficient Synthesis of Pyrrolo-/Pyrido[2,1-<i>b</i>]benzo[<i>d</i>][1,3]oxazin- 1-ones
作者:Yu Zhou、Yun Zhai、Xun Ji、Guannan Liu、Enguang Feng、Deju Ye、Linxiang Zhao、Hualiang Jiang、Hong Liu
DOI:10.1002/adsc.200900724
日期:2010.2.15
developed for the one-pot synthesis of multi-ring heterocyclic compounds such as pyrrolo-/pyrido[2,1-b]benzo[d][1,3]oxazin-1-ones from o-aminobenzyl alcohols via a gold(I)-catalyzedtandemcoupling/cyclization reaction. Significantly, the strategy presents a straightforward and efficient approach to construct novel tricyclic or polycyclic molecular architectures in which two new CN bonds and one CO bond
已开发出一种高效方法,可从邻氨基苄基化合物一锅法合成多环杂环化合物,如吡咯并//吡啶并[2,1- b ]苯并[ d ] [1,3]恶嗪-1-酮醇通过金(I)催化的串联偶联/环化反应进行合成。重要的是,该策略提出了一种直接有效的方法来构建新颖的三环或多环分子结构,其中一锅法反应操作中由两种简单的起始原料形成了两个新的CN键和一个CO键。而且,各种各样的基材可以有效地参与该过程,从而以高收率生产出所需的产品。
Gold(I)-Catalyzed Tandem Transformation: A Simple Approach for the Synthesis of Pyrrolo/Pyrido[2,1-<i>a</i>][1,3]benzoxazinones and Pyrrolo/Pyrido[2,1-<i>a</i>]quinazolinones
作者:Enguang Feng、Yu Zhou、Dengyou Zhang、Lei Zhang、Haifeng Sun、Hualiang Jiang、Hong Liu
DOI:10.1021/jo100228u
日期:2010.5.21
pyrrolo/pyrido[2,1-a][1,3]benzoxazinones and pyrrolo/pyrido[2,1-a]quinazolinones from 2-amino benzoic acids and 2-amino benzamides via a gold(I)-catalyzedtandemcoupling/cyclization process. The tricyclic or polycyclic molecular architectures were constructed in one pot with the formation of three new bonds.
我们已经开发了一种简单的方法,可通过2-氨基苯甲酸和2-氨基苯甲酰胺合成吡咯并/吡啶并[ 2,1- a ] [1,3]苯并恶嗪酮和吡咯并/吡啶并[ 2,1- a ]喹唑啉酮金(I)催化的串联偶联/环化过程。一环构建了三环或多环分子结构,形成了三个新的键。