Barbatoside, a New Iridoid Glucoside from Penstemon barbatus.]

From leaves of PENSTEMON BARBATUS N UTT. a new iridoid glucoside has been isolated. The structure was established mainly by spectroscopic methods ( (1)H-NMR, (13)C-NMR, IR, MS).     

Iso-Scrophularioside, a new iridoid glucoside from Penstemon eriantherus

From the aerial parts of Penstemon eriantherus Pursh a new iridoid glucoside was isolated and structurally elucidated as 10-cinnamoylaucubin mainly by spectroscopic methods ( (1)-NMR, (13)-NMR, MS).     

8-epi-Valerosidate, a new iridoid glucoside from Penstemon serrulatus.

From leaves of PENSTEMON SERRULATUS M ENZ. a new esteriridoid has been isolated. The structure was established by spectroscopic methods (IR, MS, (13)C-NMR) and mainly (1)H-NMR-spectroscopy as 8-epivalerosidate.     

Serrulatoloside, a New Iridoid Glucoside from Penstemon serrulatus

From leaves of PENSTEMON SERRULATUS Menz. a new iridoid glucoside of unusual type in having an exo double bond at C-8 on the cyclopentane-ring has been isolated. The structure of serrulatoloside has been established by spectroscopic methods.     

Iridoid Glucosides from Penstemon nitidus

From the leaves of PENSTEMON NITIDUS Dougl. (smooth blue beardtongue) besides the known iridoid glucosides cornin (syn. verbenalin), hastatoside and beta-dihydrohastatoside the new compound 10-hydroxycornin has been isolated. The structures of all compounds were established by spectroscopic means (FD-MS, (1)H-, (13)C-, 2D-NMR, and NOE). This is the first report of cornin and analogous 6-keto iridoids in scrophulariaceous plants. Up to now iridoid glucosides like these have only been found in plants belonging to the Cornaceae and its allies and to the Lamiaceae-Verbenaceae complex.     

Pinifolin, a new iridoid glucoside of unusual type from Penstemon pinifolius

From the aerial parts of PENSTEMON PINIFOLIUS Greene, a new iridoid glucoside of unusual type has been isolated and structurally elucidated by spectroscopic means. This new compound, called pinifolin, contains a Delta (4)-instead of a Delta (3)-double bond and a methyl ether function at carbon 3 of the iridoidic skeleton.     

Iridoid glucosides from Penstemon ovatus

In addition to aucubin, 6beta-hydroxyboschnaloside, and 6-O-(8"-hydroxy-2",6"-dimethyl-2"(E), 6"(E)-octadienoyl)-6beta-hydroxyboschnaloside, the new iridoid glucoside ovatuside has been isolated from the aerial parts of Penstemon ovatus. This iridoid was shown to be 6-O-(8"-hydroxy-2",6"-dimethyl-2"(E),6"(Z)-octadienoyl)-6beta-hydroxyboschnaloside.     

Iso-Scrophularioside, a New Iridoid Glucoside from Penstemon eriantherus.]

From the aerial parts of PENSTEMON ERIANTHERUS P URSH a new iridoid glucoside was isolated and structurally elucidated as 10-cinnamoylaucubin mainly by spectroscopic methods ( (1)-NMR, (13)-NMR, MS).     

Iridoid Glucosides and an Acetophenone Glucoside from Penstemon whippleanus

From leaves of PENSTEMON WHIPPLEANUS A. Gray three iridoid glucosides and an acetophenone glucoside have been isolated which were proved to be 10- T-cinnamoylaucubin, eurostoside, mussaenoside and picein, respectively.     

Serruloside and Serrulatoside, two New Iridoid Glycosides from Penstemon serrulatus1

From leaves of PENSTEMON SERRULATUS Menz. two new iridoid glycosides have been isolated. Both glycosides have the same aglycon part, but differ in their carbohydrate moieties. The structure of serru-loside (penstemidaglucon-11- O-beta- D-ribohexos -3-uloside) and serrulatoside (penstemidaglucon-ll- O-beta-4'-desoxyaltropyranosido-6'- O-beta- D-glucopyranoside) was established by spectroscopic methods (mainly (1)H- and (13)C-NMR) and comparison with known compounds.     

Androechin, a new chalcone glucoside from Andrographis echioides

A new chalcone glucoside, androechin, and a known flavone glucoside, echioidinin 5-O-glucoside, were isolated from the whole plant of Andrographis echioides. Androechin was characterized as 2,2',6'-trihydroxy-4'-methoxychalcone 2'-O-β-D-glucopyranoside by spectral and chemical studies.     

Galloylpaeoniflorin,a new acylated monoterpene glucoside from Paeony root

A new acylated monoterpene glucoside, galloylpaeoniflorin, was isolated from Paeony root. The structure was determined by chemical and spectroscopic methods.     

Nemoroside and nemorososide, new iridoid glucosides from Penstemon nemorosus

From leaves of PENSTEMON NEMOROSUS T RAUTV. two new esteriridoids have been isolated. Iridoidic moieties are catapol and ajugol, both esterified with 8-hydroxy-2,6-dimethyl-2,6-octadienoic acid. The structure was established by spectroscopic methods and comparison with known compounds.     

Scyphiphin D,a new iridoid glucoside dimer from Scyphiphora hydrophyllacea

From the aerial parts of Scyphiphora hydrophyllacea Gaertn. F., a new iridoid glucoside dimer scyphiphin D (1) and a known iridoid glucoside geniposidic acid (2) were isolated. The structure of this new compound was determined on the basis of HR-FAB-MS, IR, ¹H and ¹³C NMR (DEPT), and 2D NMR (HMQC, HMBC, COSY, ROESY) spectral data.     

Scyphiphin D, a new iridoid glucoside dimer from Scyphiphora hydrophyllacea

From the aerial parts of Scyphiphora hydrophyllacea Gaertn. F., a new iridoid glucoside dimer scyphiphin D (1) and a known iridoid glucoside geniposidic acid (2) were isolated. The structure of this new compound was determined on the basis of HR-FAB-MS, IR, (1)H and (13)C NMR (DEPT), and 2D NMR (HMQC, HMBC, COSY, ROESY) spectral data.     

A new glucoside from Selaginella sinensis

A new glucoside, selaginoside (1), together with two known compounds, hinokiflavone (2) and 2,3-dihydroamentoflavone (3), were isolated from the whole plants of Selaginella sinensis. Their structures were elucidated by means of spectroscopic methods.     

A new chromene glucoside from Ageratum conyzoides

The aerial parts of AGERATUM CONYZOIDES afforded a new chromene glucoside, 2,2-dimethylchromene 7- O-beta-glucopyranoside, together with a known benzofuran derivative. The structures were elucidated by high-field NMR spectroscopy.     

A new flavonoid glucoside from Rhododendron seniavinii

The leaves of Rhododendron seniavinii Maxim with little phytochemical information are used as folk remedies for the treatment of acute and chronic bronchitis in China. In our pursuing for the biologically active chemical constituents in the leaves, a new flavonoid glycoside 5,7,3′-trimethoxy-quercetin-3-O-β-d-glucopyranoside (1) was isolated from the water extract of its leaves, together with two known compounds 5,7,3′-trimethoxy-quercetin (2) and ovafolinin B-9′-O-β-d-glucopyranoside (3). The structures of the new flavonoid glucoside as well as two known compounds were elucidated by spectroscopic and chemical methods.     

A new isoflavone glucoside from Pterocarpus santalinus

A new isoflavone glucoside (1) together with the known santal has been isolated from the heartwood of Pterocarpus santalinus. Based on spectral methods, the structure of the new compound was elucidated as 4',5-dihydroxy 7-O-methyl isoflavone 3'-O-β-D-glucoside.     

Iridoids from Penstemon richardsonii

From the leaves of PENSTEMON RICHARDSONII Dougl., four valeriana-type ester iridoids have been isolated and structurally elucidated as serrulatoloside, 10-deoxypatrinoside, serrulatoloside-aglycone, and 10-deoxypatrinoside-aglycone.