A Convenient New Route to 4-Substituted Benzo[<i>de</i>][3,6]Phenanthrolin-6(6<i>H</i>)-Ones: Important Intermediates in the Synthesis of Ring-A Analogues of the Cytotoxic Marine Alkaloid Ascididemin
作者:Brent R. Copp、Richard P. Hansen、David R. Appleton、Brent S. Lindsay、Chris J. Squire、George R. Clark、Cliff E. F. Rickard
DOI:10.1080/00397919908086428
日期:1999.8.1
4-ethylthio- and 4-(4 "-methylphenylthio)benzo[de][3,6]phenanthrolin-6(6H)-one have been synthesised in 4 steps from benzoquinone and then readily converted to the 4-amino (6d) and 4-methoxy (6c) analogues by nucleophilic substitution. Further elaboration of 6d leads to the synthesis of 11-hydroxyascididemin, which we have found to exhibit antiviral activity in vitro.