Farzana Akhtar

Taraxacin, a new guaianolide from Taraxacum wallichii.

A new guaianolide, taraxacin (1), and a known sesquiterpene ketolactone (2) have been isolated from an ethyl acetate-soluble part of a methanolic extract of Taraxacum wallichii. The structure of 1 was established using NMR, MS, and X-ray crystallographic methods. The (13)C NMR data of 2 is also being reported for the first time.

Alkaloids of Fumaria indica

Abstract Two new alkaloids, papracinine and paprazine, were isolated from the aerial parts of Fumaria indica . Their structures were determined by spectral studies. Six more alkaloids isolated for the first time from this plant were identified as fumaritine N -oxide, parfumine, lastourvilline, feruloyl tyramine, fumariflorine and N -methyl corydaldine.

Three p-cymene derivatives from Zataria multiflora

Two new p-cymene derivatives named zataroside-A and zataroside-B and a new triacetoxy derivative of the same skeleton have been detected from Zataria multiflora along with p-hydroxybenzoic acid. Their structures were elucidated with the aid of NMR spectroscopy. Zataroside-A was also confirmed by X-ray diffraction technique and the same compound was found to be a strong plant growth inhibiting agent.

New isoflavones from Ceiba pentandra

Two new isoflavones, pentandrin (1) and pentandrin glucoside (2), were isolated from the stem barks of Ceiba pentandra along with beta-sitosterol and its 3-O-beta-D-glucopyranoside, which was isolated for the first time from this plant. The structures of these compounds were elucidated with the help of spectroscopic techniques, while the structure of 1 was unambiguously confirmed by single-crystal X-ray diffraction studies.

A steroidal glycoside from Clerodendron inerme

Abstract A steroidal glycoside, 3- O -β- d -galactopyranosyl-(24β)-ethylcolesta-5.22.25-trien ( 1 ), was isolated from Clerodendron inerme . Clerosterol and glutinol were also isolated from this plant.

Salvadiol: A Novel Triterpenoid from Salvia bucharica.

Abstract Salvadiol ( 1 ), a triterpene with a novel carbon skeleton has been isolated from the hexane soluble part of Salvia bucharica and characterized by single-crystal X-ray diffraction. The NMR data were rationalized on the basis of structure 1 determined by the X-ray technique. A biogenetic pathway for salvadiol is proposed.

Three New Diterpenoids from Euphorbia cheiradenia

Three new diterpene esters, cheiradone (1), cheiradone A (2), and cheiradone B (3), were isolated from the aerial parts of Euphorbia cheiradenia, collected in Iran. The structures were determined using different spectroscopic methods, including 1D and 2D NMR and X-ray diffraction analysis.

Taxane Diterpenes from Taxus baccata

Abstract From the roots of Taxus baccata, two new taxane derivatives, taxa-4(20),11-diene-10β-methoxy-2α,5α-diacetoxy-14β,α-methylbutyrate (1) and taxa-4(20-),11-diene-5α-hydroxy-1β, 7β,9α, 10β-tetraacetate (2) were obtained together with the known diterpenoids taxusin (3) 7β-acetoxytaxusin (4) and 2-deacetoxytaxinin J (5). In addition to these diterpenoids, a compound previously identified as taxa-4 (20), 11-diene, 5α,7β,10β-triacetoxy-2α,α-methylbutyrate was isolated and its structure has been revised as taxa-4(20), 11-diene-2α,5α,10β-triacetoxy-14β, α-methylbutyrate (6).