Triterpene glycosides of Astragalus and their genins. XXXI. Cycloorbigenin B from Astragalus orbiculatus

Chemistry of Natural Compounds - A new methylsteroid of the cycloartane series has been isolated from the epigeal part ofAstragalus orbiculatus Ledeb. (Leguminosae); it has the structure of a...     

Triterpene glycosides of Astragalus and their genins. XX. Cycloorbigenin from Astragalus orbiculatus

A new genin — cycloorbigenin (I), C₃₀H₄₈O₅, mp 217–219°C, [α] _D ²⁰ +28.3° (c 1.19; ethanol) has been obtained from a glycoside isolated from the epigeal parts of the plantAstragalus orbiculatus (Leguminosae), and on the basis of chemical transformation and spectral characteristics its structure has been established as 16β,23:16α,24-diepoxy-23(R),24(S)cycloartane-3β,7β,25-triol. The acetylation of (I) with acetic anhydride in pyridine yielded its diacetate (II), C₃₄H₅₂O₇, mp 148–150°C, [α] _D ²⁰ +32.6° (c 0.92; methanol) and its triacetate (III), C₃₆H₅₄O₈, mp 137–139°C, [α] _D ²⁰ +75° (c 0.4; methanol). The Jones oxidation of (I) led to a diketone (IV), C₃₀H₄₄O₅, mp 155–158°C, [α] _D ²⁰ -73° (c 0.63; methanol). Details of the PMR, IR, and mass spectra are given for all the compounds.     

Triterpene glycosides of Astragalus and their genins. XX. Cycloorbigenin from Astragalus orbiculatus

A new genin — cycloorbigenin (I), C₃₀H₄₈O₅, mp 217–219°C, [] _D ²⁰ +28.3° (c 1.19; ethanol) has been obtained from a glycoside isolated from the epigeal parts of the plantAstragalus orbiculatus (Leguminosae), and on the basis of chemical transformation and spectral characteristics its structure has been established as 16,23:16,24-diepoxy-23(R),24(S)cycloartane-3,7,25-triol. The acetylation of (I) with acetic anhydride in pyridine yielded its diacetate (II), C₃₄H₅₂O₇, mp 148–150°C, [] _D ²⁰ +32.6° (c 0.92; methanol) and its triacetate (III), C₃₆H₅₄O₈, mp 137–139°C, [] _D ²⁰ +75° (c 0.4; methanol). The Jones oxidation of (I) led to a diketone (IV), C₃₀H₄₄O₅, mp 155–158°C, [] _D ²⁰ -73° (c 0.63; methanol). Details of the PMR, IR, and mass spectra are given for all the compounds.Institute of The Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 455–460, July–August, 1986.     

Triterpene glycosides of Astragalus and their genins. XXIV. Cycloorbicoside G from Astragalus orbiculatus

A bisdesmosidic glycoside — cycloorbicoside G — has been isolated from the epigeal parts of the plantAstragalus orbiculatus Ledeb. (Leguminosae), and on the basis of chemical transformations and spectral characteristics its structure has been established as (23R,24S)-16,23;16,24-diepoxycycloartane-3,7,25-triol 25-O--D-glucopyranoside 3-O--D-xylopyranoside.Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 837–842, November–December, 1987.     

Triterpene glycosides of Astragalus and their genins. XXIV. Cycloorbicoside G from Astragalus orbiculatus

A bisdesmosidic glycoside — cycloorbicoside G — has been isolated from the epigeal parts of the plantAstragalus orbiculatus Ledeb. (Leguminosae), and on the basis of chemical transformations and spectral characteristics its structure has been established as (23R,24S)-16β,23;16α,24-diepoxycycloartane-3β,7β,25-triol 25-O-β-D-glucopyranoside 3-O-β-D-xylopyranoside.     

Triterpene glycosides of Astragalus and their genins XL. Cyclocarposide B from Astragalus coluteocarpus

In addition to cyclosieversigenin, -sitosterol -D-glucopyranoside, and cyclocarposide, we have isolated another three glycosides of triterpene nature from the epigeal part of the plantAstragalus coluteocarpus Boiss. (Leguminosae). On the basis of chemical transformations and spectral characteristics, the structure of one of the new glycosides, which we have called cyclocarposide B, has been established as 20R,24S-epoxycycloartane-3,6,16,25-tetraol 6-O--L-(2-O-acetylrhamnopyranoside) 3-O--D-xylopyranoside.Institute of Chemistry of Plant Substances, Uzbekistan Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 227–231, March–April, 1992.     

Triterpene glycosides of Astragalus and their genins XLI. Cycloexoside from Astragalus exilis

In addition to known glycosides of the cycloartane series — cyclosieversiosides A, E, and F — a new acetylated compound of glycosidic nature — cycloexoside — has been isolated from the roots ofAstragalus exilis A. Kor. (Leguminosae). On the basis of chemical transformations and spectral characteristics, the structure of cycloexoside has been established as 20R,24S-epoxycycloartane-3,6,16,25-tetrol 3-O-(2,3-di-O-acetyl--D-xylopyranoside).Institute of Chemistry of Plant Substances, Uzbekistan Academy of Sciences, Tashkent. Pamir Biological Institute, Tadhikistan Academy of Sciences, Khorog. Translated from Khimiya Prirodnykh Soedinenii, Nos. 3,4, pp. 356–360, May–August, 1992.     

Triterpene glycosides of Astragalus and their genins XXXII. Cyclocarposide from Astragalus coluteocarpus

A new triterpene glycoside of the cycloartane series, which has been called cyclocarposide, has been isolated from the epigeal part of the plantAstragalus coluteocarpus Boiss. (Leguminosae). The structure of cyclocarposide has been established on the basis of chemical transformations and spectral characteristics as 20R,24S-epoxycycloartane-3,6,16,25-tetraol 6-0--L-rhamnopyranoside 3-0--D-xylopyranoside.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Pamir Biological Institute, Academy of Sciences of the Tadzhik SSR, Khorog. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 653–656, September–October, 1990.     

Triterpene glycosides of Astragalus and their genins XXXII. Cyclocarposide from Astragalus coluteocarpus

A new triterpene glycoside of the cycloartane series, which has been called cyclocarposide, has been isolated from the epigeal part of the plantAstragalus coluteocarpus Boiss. (Leguminosae). The structure of cyclocarposide has been established on the basis of chemical transformations and spectral characteristics as 20R,24S-epoxycycloartane-3β,6α,16β,25-tetraol 6-0-α-L-rhamnopyranoside 3-0-α-D-xylopyranoside. Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Pamir Biological Institute, Academy of Sciences of the Tadzhik SSR, Khorog. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 653–656, September–October, 1990.     

Triterpene glycosides of Astragalus and their genins. XXIII. Cyclocanthogenin from Astragalus tragacantha

The epigeal part of the plantAstragalus tragantha Habl. (Leguminosea) has yielded (in addition to cyclosieversigenin, cyclocyclosiversioside F, and -sitosterol -D-glucopyranoside) a new methylsteroid of the cycloartane series — cyclocanthogenin — the structure of which has been established on the basis of chemical transformations and spectral characteristics, and also of a chemical correlation with the structure of cycloasgenin C, as 24S-cycloartane-3,6,16,24,25-pentaol.Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 817–824, November–December, 1987.     

Triterpene glycosides of Astragalus and their genins. XXIII. Cyclocanthogenin from Astragalus tragacantha

The epigeal part of the plantAstragalus tragantha Habl. (Leguminosea) has yielded (in addition to cyclosieversigenin, cyclocyclosiversioside F, and β-sitosterol β-D-glucopyranoside) a new methylsteroid of the cycloartane series — cyclocanthogenin — the structure of which has been established on the basis of chemical transformations and spectral characteristics, and also of a chemical correlation with the structure of cycloasgenin C, as 24S-cycloartane-3β,6α,16β,24,25-pentaol.     

Triterpene glycosides of Astragalus and their genins XXX. Cycloaraloside A from Astragalus amarus

In addition to -sitosterol, cyclosieversigenin, and -sitosterol -D-glucopyranoside, the roots of the plantAstragalus amarus Pall. (Leguminosae) have yielded a new triterpene glycoside of the cycloartane series — cycloaraloside A, which has the structure of 2OR,24S-epoxycycloartane-3,6,16,25-tetraol 3-O--D-glucopyranoside.Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 806–809, November–December, 1989.     

Triterpene glycosides of Astragalus and their genins XXXIX. Cycloaraloside D from Astragalus amarus

The structure of a triterpene glycoside of the cycloartane series — cycloaraloside D, isolated from the roots ofAstragalus amarus Pall. (Leguminosae) — has been established on the basis of chemical transformations and spectral characteristics. Cycloaraloside D is 20R, 24S-epoxycycloartane-3, 6, 16, 25-tetraol 3-0-[0--L-rhamnopyranosyl-(1 2)--D-glucopyranoside].Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 526–528, July–August, 1991.     

Triterpene glycosides of Astragalus and their genins XXXIV. Cycloaraloside E from Astragalus amarus

Five compounds of glycosidic nature, designated 5–9 have been isolated from the roots of the plantAstragalus amarus Pall. (Leguminosae). The structure of substance 8, which has been called cycloaraloside E, has been shown on the basis of chemical transformations and spectral characteristics. Cycloaraloside E is 20R, 24S-epoxycycloartane-3β,6α,16β,25-tetraol 3,25-di-0-β-D-glucopyranoside.     

Triterpene glycosides of Astragalus and their genins XXXV. Cycloaraloside C from Astragalus amarus

A new triterpene glycoside of the cycloartane series (cycloaraloside C) has been isolated from the roots of the plantAstragalus amarus Pall. (Leguminosae). Cycloaraloside C is a bioside of cyclosieversigenin including one D-glucose residue and one D-apiose residue. The structure of the glycoside has been shown on the basis of the chemical transformations and spectral characteristics as 20R,24S-epoxycycloartane-3,6,16,25-tetraol 3-O-[O-(D-apio--D-furanosyl)-(1 2)--D-glucopyranoside]. This is the first time that D-apiose has been found among cycloartane glycosides.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 783–787, November–December, 1990.     

Triterpene glycosides of Astragalus and their genins XXX. Cycloaraloside A from Astragalus amarus

In addition to β-sitosterol, cyclosieversigenin, and β-sitosterol β-D-glucopyranoside, the roots of the plantAstragalus amarus Pall. (Leguminosae) have yielded a new triterpene glycoside of the cycloartane series — cycloaraloside A, which has the structure of 2OR,24S-epoxycycloartane-3β,6α,16β,25-tetraol 3-O-β-D-glucopyranoside. Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 806–809, November–December, 1989.     

Triterpene glycosides of Astragalus and their genins XXXIV. Cycloaraloside E from Astragalus amarus

Five compounds of glycosidic nature, designated 5–9 have been isolated from the roots of the plantAstragalus amarus Pall. (Leguminosae). The structure of substance 8, which has been called cycloaraloside E, has been shown on the basis of chemical transformations and spectral characteristics. Cycloaraloside E is 20R, 24S-epoxycycloartane-3,6,16,25-tetraol 3,25-di-0--D-glucopyranoside.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 656–659, September–October, 1990.