Poilaneic acid,a cembranoid diterpene from Croton poilanei

Poilaneic acid, a cembranoid diterpene from Croton poilanei, has been characterized as (1R*,2E,4Z,7E, 11Z)-12-carboxyl-1-isopropyl-4,8-dimethylcyclotetradecatetraene.     

Two diterpene alcohols from Croton sublyratus

The isolation and structural elucidation of two diterpene alcohols from Croton sublyratus are described. These compounds are ent-3α-hydroxy-13-epimanool and ent-16β,17-dihydroxykaurane.     

A diterpene from Euphorbia maddeni

From the anticancer-active CHCl₃, extract of the plant Euphorbia maddeni, a polyacylated diterpene of jatrophone type, euphornin, has been isolated and its structure elucidated by physico-chemical methods.     

Alkaloid biosynthesis in Croton flavens

The biosynthesis of the morphinandienone alkaloids norsinoacutine, sinoacutine and flavinantine has been studied using 1-³ H-sinoacutine, 1-³H-norsinoacutine, 1-³H-norsinoacutinols, l-[S-methyl-¹⁴C]-methionine, glycine-2-¹⁴C, 1-³H-8,14-dihydronorsalutaridine, 1-³ H-8,14-dihydrosalutaridine, 1-³H-sinomenine, 1-³H-isosinomenine, (±)-[2-¹⁴C]phenylalanine, (±)-[N-methyl-¹⁴C]orientaline and (±)-[N-methyl-¹⁴C]reticuline.     

Two cleistanthane type diterpenes from Croton sonderianus

Sonderianol (12-hydroxy-3-oxo-cleistanth-8, 11, 13, 15-tetraene) and 3, 4-seco-sonderianol (methyl 12-hydroxy-3, 4-seco-cleistanth-8, 11, 13, 15, 18(4)-penten-3-oate), two new diterpenes with cleistanthane skeletons, were isolated from heartwood of Croton sonderianus.     

Lathyrane type diterpene esters from Euphorbia lathyris

By reversed phase HPLC ‘ester L₇’, previously isolated among several macrocyclic lathyrol derivatives from seeds of Euphorbia lathyris, was     

Macrocyclic diterpene esters of the cytotoxic fraction from Euphorbia kamerunica

The ether-soluble resin of the latex of Euphorbia kamerunica was separated into a non-polar and a polar fraction by gradient elution column chromatography. From the non-polar fraction three macrocyclic diterpene esters were isolated by adsorption and partition preparative TLC methods. These compounds were identified as 3,7,8-triacetyl-ingol-12-tigliate,3,7-diacetyl-ingol-12-tigliate and ingol-tetra-acetate by means of spectroscopic data, together with hydrolysis and partial synthesis.     

Derivatives of characiol,macrocyclic diterpene esters of the jatrophane type from Euphorbia characias

Eight non-irritant macrocyclic diterpene esters of the jatrophane type were obtained from an irritant acetone extract of latex and from an irritant methanol extract of roots of Euphorbia characias. They were shown to be diesters of the new parent alcohols characiol, characiol-5β,6β-oxide and 5β-hydroxyisocharaciol and pentaesters of 2,5β,8-trihydroxyisocharaciol.     

Teupolin III,a furanoid diterpene from Teucrium polium

A new clerodane derivative was isolated from Teucrium polium var. polium. The structure and stereochemistry have been established by detailed studies of the ¹H NMR spectra.     

Diasin,A diterpene from Croton diasii

The trunkwood of Croton diasii Pires (Euphorbiaceae) contains diasin, a novel rearranged labdanic diterpene which includes furan, carbomethoxy, γ     

Sonderianin,a furanoid diterpene from Croton sonderianus

From the heartwood of Croton sonderianus was isolated a new furanoid diterpene, sonderianin. The structure was elucidated by spectral analysis, X-ray studies and chemical evidence.     

Dulcosides A and B,new diterpene glycosides from Stevia rebaudiana

New diterpene glycosides, dulcosides A and B were isolated from Stevia rebaudiana Bertoni and their structures were established as 19-O-β-glu     

A diterpene acid from baccharis tucumanensis

The new clerodane diterpene 1 was isolated from the aerial parts of Baccharis tucumanensis (Compositae). Its structure has been determined from spectral data combined with chemical transformations.