Chemical constituents of Isodon melissoides.
Four new diterpenoids, melissoidesin E (1), F (2), G (4) and H (5), together with one known diterpenoid and two lignan glycosides, were isolated from aerial parts of Isodon melissoides. Their structures were established by spectral analysis and comparison with related compounds. The lignan glycosides (compounds 7 and 8) were the first examples to be isolated from the genus Isodon plants.
Ent-kaurane diterpenoids from Isodon rubescens var. rubescens.
Five new ent-kaurane diterpenoids xindongnins H-L (1-5), together with five known ones, xindongnins A and B (6, 7), melissoidesins G (8), dawoensin A (9), and glabcensin V (10) were isolated from Isodon rubescens var. rubescens. Their structures were elucidated by spectroscopic methods including extensive 2D NMR techniques.
Diterpenoid constituents of Rabdosia inflexa: Structure elucidation of two new diterpenoids, inflexamins A and B.
(Received February 12, 1987) Two new diterpenoids, inflexanins A and B, have been isolated from the aerial part of Rabdosia inflexa (THUNB.) HARA together with the known compounds, inflexin (3) and inflexinol (4). The structures of the new diterpenoids have been elucidated as 1 and 2 on the basis of spectral and chemical evidence.