New Hybrid Compounds Combining Fragments of Usnic Acid and Monoterpenoids for Effective Tyrosyl-DNA Phosphodiesterase 1 Inhibition
作者:Nadezhda S. Dyrkheeva、Aleksandr S. Filimonov、Olga A. Luzina、Alexandra L. Zakharenko、Ekaterina S. Ilina、Anastasia A. Malakhova、Sergey P. Medvedev、Jóhannes Reynisson、Konstantin P. Volcho、Suren M. Zakian、Nariman F. Salakhutdinov、Olga I. Lavrik
DOI:10.3390/biom11070973
日期:——
phosphodiesterase 1 (TDP1). It can remove covalent complex DNA-topoisomerase 1 (TOP1) stabilized by the TOP1 inhibitor topotecan, neutralizing the effect of the drugs. TDP1 removes damage at the 3′ end of DNA caused by other anticancer agents. Thus, TDP1 is a promising therapeutic target for the development of drug combinations with topotecan, as well as other drugs for cancer treatment. Ten new UA enamino
松萝酸 (UA) 是地衣的次生代谢产物,具有广泛的生物活性。以前,我们发现 UA 衍生物是酪氨酰 DNA 磷酸二酯酶 1 (TDP1) 的有效抑制剂。它可以去除由 TOP1 抑制剂拓扑替康稳定的共价复合体 DNA-拓扑异构酶 1 (TOP1),中和药物的作用。TDP1 去除由其他抗癌药物引起的 DNA 3' 端的损伤。因此,TDP1 是开发与拓扑替康以及其他癌症治疗药物组合的有前景的治疗靶点。合成了 10 种新的 UA 烯氨基衍生物,它们的萜烯片段和 UA 骨架的取代基发生了变化,并作为 TDP1 抑制剂进行了测试。四种化合物11a - d 的IC 500.23–0.40 μM 范围内的值。分子模型显示11a - d具有相对较短的脂肪链,适合重要的结合域。11a - d的内在细胞毒性在两种人类细胞系上进行了测试。这些化合物对两种细胞系都具有低细胞毒性,CC 50 ≥ 60 μM。11a和1
An Efficient [2 + 2 + 1] Synthesis of 2,5-Disubstituted Oxazoles via Gold-Catalyzed Intermolecular Alkyne Oxidation
作者:Weimin He、Chaoqun Li、Liming Zhang
DOI:10.1021/ja2029188
日期:2011.6.8
reaction of gold carbene intermediates generated via gold-catalyzed alkyne oxidation has been realized using nitriles as both the reacting partner and the reaction solvent, offering a generally efficient synthesis of 2,5-disubstituted oxazoles with broad substrate scope. The overall reaction is a [2 + 2 + 1] annulation of a terminal alkyne, a nitrile, and an oxygen atom from an oxidant. The reaction conditions
Synthese und Circulardichroismus optisch aktiver Carotinoidmodelle
作者:Richard Buchecker、Urs Marti、Conrad Hans Eugster
DOI:10.1002/hlca.19820650323
日期:1982.5.5
Synthesis and Circular Dichroism of Optically Active Carotenoid Models
光学活性类胡萝卜素模型的合成和圆二色性
Poly‐γ‐
<i>S</i>
‐perillyl‐
<scp>l</scp>
‐glutamate and Poly‐γ‐
<i>S</i>
‐perillyl‐
<scp>d</scp>
‐glutamate: Diastereomeric Alignment Media Used for the Investigation of the Alignment Process
作者:Marcel Alcaraz Janßen、Christina M. Thiele
DOI:10.1002/chem.201905447
日期:2020.6.23
polypeptide‐based alignmentmedia with an additional chiral center in the side chain derived from perillyl alcohol were synthesized and their properties were investigated (secondary structure, liquid crystallinity, etc.). The enantiomers of isopinocampheol and β‐pinene were used as model analytes for the study of enantiodiscrimination. Additionally, the usage of 1H–1H‐RDCs to improve the alignment tensor quality
SN2′ Alkylation of Cyclopropanols via Homoenolates
作者:Pragna Pratic Das、Ken Belmore、Jin Kun Cha
DOI:10.1002/anie.201205190
日期:2012.9.17
Reining in reactivity: Stereoselective SN2′ alkylation of cyclopropanols has been devised under the control of mixed zinc/copper reagents. This method provides convenient access to enantiopure keto homoenolates which react with electrophiles (El+) to form CC bonds. M=metal.
增强反应活性:在混合锌/铜试剂的控制下,设计了环丙醇的立体选择性S N 2'烷基化反应。此方法提供了对映体纯的酮homoenolates其与亲电致发光(EL反应方便地访问+)形成C C键。M =金属。