<i>N</i>-Oxyl-Radical-Catalyzed Intermolecular Aminooxygenation of Styrenes and Inter/intramolecular Aminoalkoxylation of Homoallylic Alcohols
作者:Shiue-Shien Weng、Jia-Wei Zhang
DOI:10.1002/cctc.201601183
日期:2016.12.19
By taking advantage of the redox cycle between the reductive N‐oxyl radical and its oxidative oxoammonium counterpart, the N‐oxyl‐radical‐catalyzed intermolecular aminohydroxylation of styrenes with N‐fluorobenzenesulfonimide was developed. Various vinyl arenes were aminohydroxylated in moderate to excellent yields with high regio‐ and diastereoselectivities by using environmentally benign H2O as the
One-pot synthesis of 1,4-dihydroxy-2-(( E )-1-hydroxy-4-phenylbut-3-enyl)anthracene-9,10-diones as novel shikonin analogs and evaluation of their antiproliferative activities
作者:Li-Ming Zhao、Feng-Xia Cao、Hai-Shan Jin、Jie-Huan Zhang、Jeffrey Szwaya、Guangdi Wang
DOI:10.1016/j.bmcl.2016.04.006
日期:2016.6
synthesized in a one-pot reaction of quinizarin with β,γ-unsaturated aldehydes in MeOH under mild conditions and investigated for their cytotoxicity against four cancer cell lines and one normal cell line. The synthesized compounds were found to be cytotoxic against HeLa cells with no apparent toxicity against normal cell line. Further modification led to the discovery of a novel tetracyclic anthraquinone
mild method is reported for the construction of β-chlorotetrahydrofuran derivatives by 5-endo chlorocycloetherification of homoallylic alcohols. The system employs sulfurylchloride as the chlorinating agent under catalyst-free conditions. A variety of homoallylic alcohols with aryl or alkyl substituents were smoothly converted into β-chlorotetrahydrofurans in yields up to 98%. An efficient and mild method