Phytochemical Studies on <i>Stemona </i>Plants: Isolation of Stemofoline Alkaloids
作者:Thanapat Sastraruji、Araya Jatisatienr、Stephen G. Pyne、Alison T. Ung、Wilford Lie、Morwenna C. Williams
DOI:10.1021/np050361y
日期:2005.12.1
Six new stemofoline alkaloids, (2'R)-hydroxystemofoline (5), (3'R)-stemofolenol (6), (3'S)-stemofolenol (7), 1',2'-didehydrostemofoline-N-oxide (8), the first C-19 stemofoline alkaloid, methylstemofoline (9), and the first glycosidated Stemona alkaloid, stemofolinoside (10), and three known alkaloids, (2'S)-hydroxystemofoline (2), (11Z)-l',2'-didehydrostemofoline (3), and (11E)-l',2'-didehydrostemofoline (4), have been isolated from a root extract of an unidentified Stemona species. The structure and relative configuration of these new alkaloids have been determined by spectral data interpretation and from semisynthetic studies.