Syntheses and antiproliferative activity of some sulfated hydroximinosterols
摘要:
Four new sulfated steroidal compounds, sodium 3-hydroxy-6-hydroximinocholestane 3-sulfate (7a), sodium 3-hydroxy-6-hydroximinostigmastane 6-sulfate (7b), sodium 3-hydroxy-6-hydroximinocholest-4-ene 3-sulfate (10a), and sodium 6-hydroxy-3-hydroximinocholestane 6-sulfate (16) had been synthesized using cholesterol or stigmasterol as starting materials by different synthetic methods. The synthetic compounds were characterized by their analytical and spectral data, and their antiproliferative activity against MGC 7901 (human gastric carcinoma cell line), HeLa (human cervical carcinoma cell line), and SMMC 7404 (human liver carcinoma cell line) were investigated. The results showed that the compounds exhibited a remarkable cytotoxicity against HeLa tumor cells in vitro and 7a displayed a better cytotoxicity than cisplatin (a positive contrast).
hydroximino on ring A and B displayed remarkable distinct cytotoxicities against a diversity of cancer cell types. Presence of an oxime group on ring B and a hydroxy on ring A or B resulted in a higher cytotoxicity than other structural motifs. In addition, a cholesterol-type side chain at position 17 was required for the biological activity. Our findings provide new evidence showing the relationship
化合物的侧链在其生物学功能中起着重要作用。在我们的研究中,我们发现具有不同侧链和羟基氨基在环 A 和 B 上位置的羟基亚氨基类固醇衍生物对多种癌细胞类型显示出显着不同的细胞毒性。环 B 上的肟基团和环 A 或 B 上的羟基导致比其他结构基序更高的细胞毒性。此外,生物活性需要第 17 位的胆固醇型侧链。我们的研究结果提供了新的证据,表明化学结构与生物功能之间的关系。从研究中获得的信息可能有助于设计新型化疗药物。
Phytosterols as precursors for the synthesis of aromatase inhibitors: Hemisynthesis of testololactone and testolactone
作者:Shabir H. Lone、Khursheed A. Bhat
DOI:10.1016/j.steroids.2015.02.011
日期:2015.4
involves highly effective Oppaneur oxidation of both beta-sitosterol as well as stigmasterol to generate the required enone moiety in ring 'A' of the desired steroid system. The Oppaneur oxidation products of both beta-sitosterol and stigmasterol were then subjected to oxidative cleavage of the sidechain to produce 4-androstene-3,17-dione. Baeyer-Villiger oxidation of 4-androstene-3,17-dione using m-CPBA
Nickel-Catalyzed Reductive Cross-Coupling of Propargylic Acetates with Chloro(vinyl)silanes: Access to Silylallenes
作者:Chong-Hui Xu、Zhi-Qiang Xiong、Jing-Hao Qin、Xin-Hua Xu、Jin-Heng Li
DOI:10.1021/acs.joc.3c02228
日期:2024.3.1
achieve. Herein, nickel-catalyzed reductive cross-coupling reactions between propargyl acetates and substituted vinyl chlorosilanes for the synthesis of tetrasubstituted silylallenes are described. Therein, metallic zinc is a crucial reductant that effectively enables two electrophilic reagents to selectively construct C(sp2)–Si bonds. Additionally, a Ni-catalyzed reductive mechanism involving a radical
A Recyclable Electrochemical Reduction of Aldehydes and Ketones to Alcohols Using Water as the Hydrogen Source and Solvent
作者:Jiatai Zhang、Meng Chen、Jing Xiao、Hongliang Han、Jianyou Zhao、Lanlan Zhang、Fan Wang、Zhong-Quan Liu
DOI:10.1021/acs.joc.4c00476
日期:——
hazardous hydrogensources and severe environmental pollution in the conventional reduction of aldehydes/ketones to alcohols. We report here a practical, safe, and green electrochemical reduction, which solves these problems to a large extent. Through an undivided cell, Zn(+) and Sn(−) as the electrode, tetrabutylammonium chloride (TBAC) as the electrolyte, water as the solvent and hydrogensource, a wide