Phytochemical Studies on <i>Stemona </i><i>b</i><i>urkillii</i> Prain: Two New Dihydrostemofoline Alkaloids
作者:Pitchaya Mungkornasawakul、Stephen G. Pyne、Araya Jatisatienr、Wilford Lie、Alison T. Ung、Kritchaya Issakul、Auntika Sawatwanich、Damrat Supyen、Chaiwat Jatisatienr
DOI:10.1021/np049791z
日期:2004.10.1
Two new dihydrostemofoline alkaloids, 11(S),12(R)-dihydrostemofoline (3) and stemoburkilline (4), along with stemofoline (1) and 2'-hydroxystemofoline (2) have been isolated from a root extract of Stemona burkillii Prain. The structure and relative configuration of 3 have been determined via spectroscopic data and from comparison with synthetic 11(S),12(S)-dihydrostemofoline (5). The configuration of the exo-cyclic alkene group in 4 is tentively assigned as E on the basis of mechanistic considerations.