Catalyst- and Oxidizing Reagent-Free Electrochemical Benzylic C(sp<sup>3</sup>)–H Oxidation of Phenol Derivatives
作者:Zhong-Wei Hou、Ming-Ming Zhang、Wen-Chao Yang、Lei Wang
DOI:10.1021/acs.joc.2c00455
日期:2022.6.17
A site-selective electrochemical approach for the benzylic C(sp3)–H oxidation reaction of phenolderivatives along with hydrogen evolution has been developed. The protocol proceeds in an easily available undivided cell at room temperature under catalyst- and oxidizing reagent-free conditions. The corresponding aryl aldehydes and ketones are obtained in satisfactory yields, and the gram-scale synthesis
Structure-activity relationship for DNA topoisomerase II-induced DNA cleavage by azatoxin analogues
作者:Jose S. Madalengoitia、Jetze J. Tepe、Karl A. Werbovetz、Erich K. Lehnert、Timothy L. Macdonald
DOI:10.1016/s0968-0896(97)00113-2
日期:1997.9
Eighteen analogues of the nonintercalative DNA topoisomerase II (topo II)-active epipodophyllotoxin-ellipticine hybrid, azatoxin, were synthesized and evaluated for their ability to induce topo II-mediated DNA strand breaks in vitro. In general, the SAR profile of the azatoxins showed more homology with that of the epipodophyllotoxins than with the ellipticines. Of the compounds studied, only fluoro substitution at the 8-, 9, and 10-positions of azatoxins enhanced activity, with 9-fluoroazatoxin being the most active compound in this series. (C) 1997 Elsevier Science Ltd.