Synthesis of pyrrolizidine alkaloids indicine, intermedine, lycopsamine, and analogs and their N-oxides. Potential antitumor agents
作者:Leon H. Zalkow、Jan A. Glinski、Leslie T. Gelbaum、Thomas J. Fleischmann、Laureen S. McGowan、Maureen M. Gordon
DOI:10.1021/jm00383a001
日期:1985.6
(-)- and (+)-trachelanthic and (-)- and (+)-viridifloric acids were synthesized and their isopropylidene derivatives were regiospecifically coupled, at C-9, with (-)-retronecine obtained by hydrolysis of monocrotaline, isolated from Crotalaria spectabilis. Hydrolysis, followed by oxidation, led to the N-oxides of indicine, intermedine, lycopsamine, and the new nonnatural product, respectively. Each