Synthesis and<i>In Vitro</i>Antibacterial Activity of Novel Steroidal (6R)-Spiro-1,3,4-thiadiazoline Derivatives
作者:Salman A. Khan、Abdullah M. Asiri
DOI:10.1002/jhet.1014
日期:2012.11
Novelsteroidal (6R)‐spiro‐1,3,4‐thiadiazoline derivatives were synthesized by the cyclization of steroidal thiosemicarbazones with acetic anhydride, screened in vitro against antibacterial activity using disc‐diffusion method and the minimum inhibitory concentration. The results showed that steroidal thiadiazoline derivatives exhibited better antibacterial activity than the steroidal thiosemicarbazone
Multiple Enone-Directed Reactivity Modes Lead to the Selective Photochemical Fluorination of Polycyclic Terpenoid Derivatives
作者:Cody Ross Pitts、Desta Doro Bume、Stefan Andrew Harry、Maxime A. Siegler、Thomas Lectka
DOI:10.1021/jacs.7b00335
日期:2017.2.15
orientation of the oxygen atom, site-selective photochemicalfluorination is achieved on steroids and bioactive polycycles with up to 65 different sp3 C-H bonds. We have also found that γ-, β-, homoallylic, and allylic fluorination are all possible and predictable through the theoretical modes reported herein. Lastly, we present a preliminary mechanistic hypothesis characterized by intramolecular hydrogen
Synthesis and biological evaluation of some thiazolidinone derivatives of steroid as antibacterial agents
作者:Salman Ahmad Khan、Mohammed Yusuf
DOI:10.1016/j.ejmech.2008.09.004
日期:2009.6
Steroidal thiazolidinone derivatives were prepared by the multi-step reactions of steroid. It is prepared from steroidal thiosemicarbazones with ethyl bromoacetate in dioxane. Steroidal thiosemicarbazones were prepared by the reaction of thiosemicarbazide with steroidal ketones. The structures of these compounds were elucidated by IR, 1H NMR, Fab mass spectrometries and their purities were confirmed
甾体噻唑烷酮衍生物是通过类固醇的多步反应制备的。它是由甾族硫半脲与溴乙酸乙酯在二恶烷中制得的。通过使硫代氨基脲与甾族酮反应制备甾族硫代氨基脲。这些化合物的结构已通过IR(1)进行了阐明。通过元素分析证实了1 H NMR,Fab质谱及其纯度。通过圆盘扩散测定法评估了这些化合物对两种革兰氏阳性细菌和两种革兰氏阴性细菌的抗菌活性,然后确定了化合物的最小抑菌浓度(MIC)。结果表明,与两种细菌(革兰氏阳性和革兰氏阴性)的甾体硫代半碳酰胺衍生物相比,甾体噻唑烷酮衍生物具有更好的抑制生长的作用。与标准药物阿莫西林相比,化合物7和8是更好的抗菌剂。
Synthesis and characterization of steroidal heterocyclic compounds, DNA condensation and molecular docking studies and their in vitro anticancer and acetylcholinesterase inhibition activities
reported methods in which compounds 10–12 exhibited good antioxidant activity. Nonenzymatic degradation of DNA has been investigated. The acetylcholinesterase (AChE) inhibitor activities of the steroidal derivatives are also evaluated using Ellman's method. Moreover, the application of compound 6 as a DNA gene transporter is evaluated by DNA condensation and ascertained by employing TEM and AFM, which illustrate
一种简便,对于一个新的系列甾族杂环化合物(中的合成方便和有效的方法4-12由化合物(混合物反应)1E-3E)与ö -aminothiophenol / ö氨基苯酚/ ö苯二胺报道。根据IR,1 H NMR,13 C NMR,MS和分析数据确认产物的结构分配。基于计算预测和药代动力学特性,这些化合物服从Lipinski的“五规则”分析。抗癌活性已在体外测试通过MTT分析,可针对三种癌细胞系Hep3B(人类肝细胞癌),MCF7(人类乳腺腺癌),HeLa(人类宫颈癌)和一种非癌性正常细胞,即PBMC(外周血单核细胞)。此外,还通过各种报道的方法对合成的化合物的体外抗氧化活性进行了测试,其中化合物10-12表现出良好的抗氧化活性。已经研究了DNA的非酶降解。还使用Ellman方法评估了甾体衍生物的乙酰胆碱酯酶(AChE)抑制剂活性。此外,化合物6的应用DNA转运蛋白的合成是通过DNA缩合来评估的,
Tin(<scp>II</scp>) chloride dihydrate–a mild reagent for the transformation of 6-nitro-Δ<sup>5</sup>-steroids to 5α-hydroxy-6-ketosteroids
作者:Gireesh M. Singhal、Nalin B. Das、Ram P. Sharma
DOI:10.1039/c39900000498
日期:——
Reaction of excess hydrated tin(II) chloride with 6-nitro-Î5-steroids (1aâg) and (5) in tetrahydrofuran furnishes 5α-hydroxy-6-ketosteroids (2aâg) and (6) respectively, in good yields.