Shaheen Bano

Saponins from the leaves of Guaiacum officinale

Abstract Guaiacin, C, D, E and F, four new saponins, have been isolated from the leaves of Guaiacum officinale and characterised on the basis of chemical investigation and spectroscopic studies as 3- O -[α- l -rhamnopyranosyl(1 → 2)α- l -arabinopyranosyl(3 → 1)β- d -glucopyranosyl]-30-norolean-12,20(29)-dien-28-oic acid; 3- O -[α- l -rhamnopyranosyl-(1 → 2)α- l -arabinopyranosyl(3 → 1)β- d -glucopyranosyl]-30-norolean-12,20(29)-dien-28- O -[β- d -glucopyranosyl] ester; 3- O -[β- d -glucopyranosyl(1 → 2)α- l -arabinopyranosyl(3 → 1)β- d -glucopyranosyl]-30-norolean-12,20(29)-dien-28- O -[β- d -glucopyranosyl]ester; 3- O -[β- d -glucopyranosyl(1 → 2)α- l -arabinopyranosyl(3 → 1)β- d -glucopyranosyl] oleanolic acid-28- O -[β- d -glucopyranosyl]ester.

Chemical examination of nepeta hindostana (roth) haines the structure of nepeticin

Abstract The structure of nepeticin, a new triterpenoid isolated from Nepeta hindostana , has been determined.

Two saponins from fruits of Guaiacum officinale

Abstract From the fruit of Guaiacum officinale , two new saponins were isolated and characterized by chemical eactions and spectroscopic means as 3- O -[α- l -rhamnopyranosyl (1→3)α- l -rhamnopyranosyl (1→2)α- l -arabinopyranosyl(3→1)β- d -glucopyranosyl]-30- nor -olean-12,20(29)-dien-28-oic acid-28- O -[β- d -glucopyranosyl(1→6)β- d -glucopyranosyl]ester and 3- O -[α- l -rhamnopyranosyl(1→3)α- l -rhamnopyranosyl (1→2)α- l -arabinopyranosyl(3→1)β- d -glucopyranosyl]oleanolic acid-28- O -[β- d -glucopyranosyl(l→6)β- d -glucopyranosyl] ester.

Sapogenins from Guaiacum officinale

Abstract Acid hydrolysis of the saponins from the stem bark of Guaiacum officinale yielded the new sapogenin 3β,20η-dihydroxy-30-norolean-12-en-28-oic acid and the artifacts 3β-hydroxy-30-norolean-12,19-dien-28-oic acid and its methyl ester. Larreagenin, sitosterol and oleanolic acid were also isolated.

Pinnatazane, a bridged cyclic ether sesquiterpene from Laurencia pinnatifida

Abstract Pinnatazane, a bridged cyclic ether sesquiterpene, has been isolated from Laurencia pinnatifida and structurally characterized with X-ray crystallographic and spectroscopic techniques.

A triterpene acid from Nepeta hindostana

Abstract A new triterpene acid has been isolated from alcoholic extract of Nepeta hindostana and its structure is elucidated as 2α,3β,23-trihydroxyurs-12-en-28-oic acid.

Isolation of two new saponins, guaianin D and E from the bark of Guaiacum Officinale.

Abstract Two new saponins guaianin D (1) and E (2), obtained from the bark of Guaiacum officinale have been characterised by 13C-nmr spectroscopy and chemical reactions.The complete structure of these saponins have been determined as 3-0[α-L-rhamnopyranosyl (1 → 3) [α-L-rhamnopyranosyI] (1→ 2) α-L-arabinopyranosyl (3 → 1)-(β-D-glucopyranosyl]-30-norolean-12,20 (29) dien-28-oic acid (1) and 3-0-[α-L-rhamnopyranosyl] (1 → 3)-[α-L-rhamno-pyranosyl] (1 → 2)-[a-L-arablnopyranosyl (3 → 1)-[β -D-glucopyranosyl] 30-norolean-12, 20(29)-dien-28-0-[β-D-glycopyranosyl] ester (2).

Starfish saponins part 32. Structure of a novel steroidal 5-0-methyl galactofuranoside from the starfish astropecten indicus.

Abstract Extended spectroscopic analysis has led to the derivation of structure for a novel steroidal glycoside isolated from the starfish Astropecten indicus ; this compound, named indicoside A, contains a 5-0-methyl-β-galactofuranosyl moiety linked to C-28 of 24-methyl-5α-cholestane-3β,6α,7α,8,15β,24, 28-heptanol aglycone (1).

Dolastane diterpenoids from the brown alga Dictyota indica

From the acetone extract of Dictyota indica, three new dolastane diterpenoids have been isolated together with the previously known amijiol. Their structures have been established on the basis o spectral data, in comparison with known related compounds.

Chemical Constituents of Endarachne binghamiae (Scytosiphonales, Phaeophyta) from the Karachi Coast

Hexadecanoic acid, 24-methyIene cholesterol and D-mannitol were isolated and their identities confirmed from methanolic extracts of Endarachne binghamiae J. Agardh collected intertidally on the coast of Pakistan near Karachi.