Two unusual nitro-substituted hasubanan-type alkaloids, stephalonines J （1） and K （2）, together with ten known alkaloids, protostephanine, dehydrostephanine, （-）-stephanine, （-）-isolaureline, R-roemeroline, ...Two unusual nitro-substituted hasubanan-type alkaloids, stephalonines J （1） and K （2）, together with ten known alkaloids, protostephanine, dehydrostephanine, （-）-stephanine, （-）-isolaureline, R-roemeroline, （＋）-pronuciferine, （ ＋）-stephafine, （ ＋ ）-N-acetylstephafine, （ ＋ ）-lirioferine, and （ ＋ ）-norlirioferine, were isolated from the whole plant of Stephania longa. Their structures were characterized mainly by spectroscopic methods including IR, MS, and NMR experiments, and the structures of 1 and 2 were further confirmed through chemical correlations with the known alkaloids stephalonines A （1a） and B （2a）, respectively.展开更多
基金Project supported by the National Natural Science Foundation of China （No. 30025044）, Shanghai Municipal Scientific Foundation （No. 04XD 14019）, and the Foundation from the Ministry of Science and Technology （No. 2002CB512807） of China.
文摘Two unusual nitro-substituted hasubanan-type alkaloids, stephalonines J （1） and K （2）, together with ten known alkaloids, protostephanine, dehydrostephanine, （-）-stephanine, （-）-isolaureline, R-roemeroline, （＋）-pronuciferine, （ ＋）-stephafine, （ ＋ ）-N-acetylstephafine, （ ＋ ）-lirioferine, and （ ＋ ）-norlirioferine, were isolated from the whole plant of Stephania longa. Their structures were characterized mainly by spectroscopic methods including IR, MS, and NMR experiments, and the structures of 1 and 2 were further confirmed through chemical correlations with the known alkaloids stephalonines A （1a） and B （2a）, respectively.
