T.P. Ramamoorthy

Clerodane diterpenoids of Salvia lineata

Abstract The aerial parts of Salvia lineata afforded, in addition to sitosterol, oleanolic acid and flavonoids of known structures, three clerodane derivatives related to salviarin and gensnerofolin B. The structures were elucidated by spectroscopic and chemical means.

Abietane and icetexane diterpenoids from the roots of Salvia aspera

From the roots of Salvia aspera, two new icetexane diterpenoids (salviasperanol and 5,6-dihidro-6α-hydroxysalviasperanol) and one new abietane derivative (6-epi-demethylesquirolin D) were isolated in addition to the previously known diterpenoids sugiol, taxodione and demethylsalvicanol. The structures of the new compounds were established by spectroscopic means. An X-ray analysis was performed on salviasperanol.

Further ent-clerodane diterpenoids from Salvia melissodora

Abstract From the aerial parts of Salvia melissodora , ten ent -clerodane diterpenoids were isolated. One of the compounds had been isolated previously from another population of the same plant. However, seven of the compounds constitute new natural products. The structures of these compounds were established by spectroscopic and chemicals means. Oleanolic acid and sitosterol were also found in this species.

Abietane diterpenoids from Salvia pubescens

Abstract From the aerial parts of Salvia pubescens , two new abietane diterpenoids were isolated and their structures established by spectroscopic means. The known 7α-acetoxy-royleanone, conacytone, nemorone and desacetylnemorone were also isolated.

Semiatrin, a neo-clerodane diterpenoid from Salvia semiatratha

Abstract From the aerial part of Salvia semiatratha , a known diterpenoid and a new neo-clerodane diterpenoid, semiatrin, were isolated. The structure of the new diterpenoid was established mainly by spectroscopic means.

Abietane type diterpenoids from Salvia fruticulosa. A revision of the structure of fruticulin B

Abstract The structures of fruticulin A and its free phenol derivative, highly oxidized diterpene quinones isolated from Salvia fruticulosa, were determined by spectroscopic methods, chemical transformations and X-ray crystallographic analysis of one of them. The structure of fruticulin B is revised to a linear arrangement as a result of an X-ray diffraction analysis.

Abietane diterpenoids of Salvia anastomosans

Abstract The aerial parts of Salvia anastomosans afforded, in addition to oleanolic and ursolic acids, three abietane diterpenoids: conacytone and icetexone, of known structures, and anastomosine, a new 9(10→20)-abeo-abietane diterpenoid whose structure was elucidated by spectroscopic and chemical means.

Clerodane-type diterpenoids from Salvia sousae

Abstract The aerial parts of Salvia sousae afforded, in addition of two flavones of known structure, two new clerodane derivatives related to linearifoline and languiduline. The structures were elucidated by spectroscopic means.

Clerodane diterpenoids from Salvia urolepis

Abstract From the aerial parts of Salvia urolepis , three new neoclerodane diterpenoids were isolated. Their structures were determined by spectroscopic means. The known languidulane diterpenoid 2 α -hydroxy-7- epi -8 β , 17-dihydro-languiduline was also obtained.

Clerodane and seco-clerodane diterpenoids from Salvia reptans

Abstract β-Sitosterol, oleanolic and ursolic acids, the flavone diosmetin and two novel diterpenoids: 1α,2α-epoxy-3,4α-dihydrolinearolactone and salvireptanolide, a 5,6- seco -clerodane with an aromatic ring, were isolated from Salvia reptans . The structures of the new substances were established by spectroscopic means and an X-ray analysis performed on 1α,2α-epoxy-3,4α-dihydrolinearolactone.