Pharmacophore Hybridization To Discover Novel Topoisomerase II Poisons with Promising Antiproliferative Activity
摘要:
We used a pharmacophore hybridization strategy to combine key structural elements of merbarone and etoposide and generated new type II topoisomerase (topoII) poisons. This first set of hybrid topoII poisons shows promising antiproliferative activity on human cancer cells, endorsing their further exploration for anticancer drug discovery.
N-单和N,N-二烷基/二芳基巴比妥酸以单一互变异构体的形式存在于溶液中。的13 C NMR谱显示,它们存在于在许多极性和非极性溶剂的三酮形式。然而,2-硫代巴比妥酸衍生物显示出广泛的互变异构化。利用模型11a,11c,12b和12d实现了其13 C化学位移分配并据此确定相对互变异构体的分配比例。这些比率与各种溶剂的介电常数(ϵ)相关。硫代巴比妥酸还与具有羰基的溶剂形成加合物,只有具有硫酮或硫酚基的巴比妥酸酯才具有这种特征。6-氨基,6-甲基尿嘧啶和硫尿嘧啶以稳定的“烯”形式存在于DMSO溶液中,与乳清酸24及其硫代类似物25一样。化合物25在加热时或在溶液中长时间放置时会发生歧化和互变异构。关于“ 4,6-二羟基嘧啶”结构的文献矛盾,26,被解析,其互变异构体在溶液中由13 C nmr正确分配。
The Laccase-Catalyzed Domino Reaction between Catechols and Heterocyclic 1,3-Dicarbonyls and the Unambiguous Structure Elucidation of the Products by NMR Spectroscopy and X-ray Crystal Structure Analysis
thiocoumarins) using aerial oxygen as the oxidant delivers benzofuropyridinones, benzofuroquinolinones, and thiocoumestans in a simple fashion, highly regioselectively with yields ranging from 55 to 98%. With barbituric acid derivatives the exclusive formation of dispiropyrimidinone derivatives takes place. The unambiguous and complete structureelucidation of all reaction products has been achieved
2-Nitroallyl carbonate-based green bifunctional reagents for catalytic asymmetric annulation reactions
作者:Alexey A. Kostenko、Kseniya A. Bykova、Alexander S. Kucherenko、Andrey N. Komogortsev、Boris V. Lichitsky、Sergei G. Zlotin
DOI:10.1039/d0ob02283g
日期:——
2-Nitroallylic carbonates, a new class of “green” 1,3-bielectrophilic reagents for organic synthesis and catalysis, have been prepared. The bifunctional tertiary amine-catalyzed asymmetric [3 + 3] annulations of cyclic enols with these reagents occur much faster than corresponding reactions with 2-nitroallylic esters and produce no acidic by-products poisoning the catalyst. Furthermore, 2-nitroallylic
Optical Information Recording Medium and Optical Information Recording Method
申请人:Watanabe Tetsuya
公开号:US20070286059A1
公开(公告)日:2007-12-13
An optical information recording medium, comprising on a substrate a recording layer containing a dye compound having a specific structure. An optical information recording method, comprising recording information on the optical information recording medium by irradiation with laser light of a wavelength of 550 or shorter or 440 nm or shorter.