571-70-0Relevant academic research and scientific papers
Asymmetric synthesis of phenanthroindolizidine alkaloids with hydroxyl group at the C14 position and evaluation of their antitumor activities
Ikeda, Takashi,Yaegashi, Takashi,Matsuzaki, Takeshi,Hashimoto, Syusuke,Sawada, Seigo
scheme or table, p. 342 - 345 (2011/02/27)
The asymmetric total synthesis of the strongly cytotoxic phenanthroindolizidine alkaloid 3 was achieved. Using the same route, various derivatives were also synthesized. Cytotoxicity of those synthetic compounds was evaluated and compounds 19, 23, and 27
Efficient and chirally specific synthesis of phenanthro-indolizidine alkaloids by parham-type cycloacylation
Wang, Ziwen,Li, Zheng,Wang, Kailiang,Wang, Qingmin
experimental part, p. 292 - 299 (2010/03/30)
A concise, efficient and modular route involving Parhamtype cycloacylation as the key step has been used to synthesize six enantiopure phenanthro- indolizidine alkaloids 1a-c. The preparation of enantiomerically pure tylophora alkaloids and their seco analogues on a large-scale is now feasible. The alcohol intermediates 8a-c, which are difficult to prepare by other synthetic methodologies, have been synthesized by a metallation-cyclization-reduction sequence in excellent yields.
