Synthesis of Hexahydrocyclopenta[c]furans by an Intramolecular Iron-Catalyzed Ring Expansion Reaction
作者:Gerhard Hilt、Patrick Bolze、Maja Heitbaum、Katrin Hasse、Klaus Harms、Werner Massa
DOI:10.1002/adsc.200700035
日期:2007.8.6
The intramolecular iron-catalyzed ring expansionreaction of epoxyalkenes was investigated with a preformed iron(salen) [Fe(Salen)] complex. The formal insertion of the alkene into the epoxide generated hexahydrocyclopenta[c]furan derivatives in moderate to good yields and diastereoselectivities depending on other functional groups present in the starting materials. In addition, oxygen-tethered epoxyalkenes
用预先形成的铁(salen)[Fe(Salen)]配合物研究了环氧烯烃的分子内铁催化的环膨胀反应。取决于起始原料中存在的其他官能团,烯烃以中等至良好的产率和非对映选择性正式插入环氧化物生成的六氢环戊[ c ]呋喃衍生物中。另外,将氧束缚的环氧烯烃用于木脂素异构体的合成。讨论了Fe(Salen)催化反应过程的范围和局限性。
Ring-opening iodination and bromination of unstrained cycloalkanols through β-scission of alkoxy radicals
作者:Jiang-Ling Shi、Yuankai Wang、Zixuan Wang、Bowen Dou、Jianbo Wang
DOI:10.1039/d0cc01720e
日期:——
Ring-opening iodination or bromination of unstrained cycloalkanols with NaI or NaBr and PhI(OAc)2 under visible light irradiation is developed. In this protocol the concentration of I2 is modulated through the generation of triiodide (I3-), thus significantly avoiding undesired side reactions. The reaction is under mild conditions and has a wide substrate scope, thus providing a practically useful
Synthesis and in Vitro Anticancer Activity of the First Class of Dual Inhibitors of REV-ERBβ and Autophagy
作者:Esther Torrente、Chiara Parodi、Luisa Ercolani、Claudia De Mei、Alessio Ferrari、Rita Scarpelli、Benedetto Grimaldi
DOI:10.1021/acs.jmedchem.5b00511
日期:2015.8.13
Autophagy inhibition is emerging as a promising anticancer strategy. We recently reported that the circadian nuclear receptor REV-ERB beta plays an unexpected role in sustaining cancer cell survival when the autophagy flux is compromised. We also identified 4-[[[1-(2-fluorophenyl)cyclopentynamino]methyl]-2-[(4-methylpiperazin-1-yl)methyl]phenol, 1 (ARN5187), as a novel dual inhibitor of REV-ERB beta and autophagy. 1 had improved cytotoxicity against BT-474 breast cancer cells compared to chloroquine, a clinically relevant autophagy inhibitor. Here, we present the results of structure activity studies, based around 1, that disclose the first class of dual inhibitors of REV-ERB beta and autophagy. This study led to identification of 18 and 28, which were more effective REV-ERB beta antagonists than 1 and were more cytotoxic to BT-474. The combination of optimal chemical and structural moieties of these analogs generated 30, which elicited 15-fold greater REV-ERB beta inhibitory and cytotoxic activities compared to 1. Furthermore, 30 induced death in a panel of tumor cell lines at doses 5-50 times lower than an equitoxic amount of chloroquine but did not affect the viability of normal mammary epithelial cells.
OSMAN, A. M.;BADR, M. Z. A.;EL-NAGGAR, G. M.;ALY, M. M.;FAHMY, A. M., EGYPT. J. CHEM., 1984, 27, N 1, 1-9
作者:OSMAN, A. M.、BADR, M. Z. A.、EL-NAGGAR, G. M.、ALY, M. M.、FAHMY, A. M.