A new procedure has been developed for the synthesis of diterpenoid (16 S)-dihydrosteviol
[(16 S)-13-hydroxy-ent-kauran-19-oic acid] by acid hydrolysis (0.7% hydrochloric acid) of …

Abstract 16α, 17-and 15α, 16-Epoxy derivatives of diterpenoid steviol having ent-kaurane
structure were found for the first time to undergo Wagner-Meerwein rearrangement in …

A convenient method for isolating isosteviol from the plant Stevia Rebaudiana Bertoni
(stevia). The major glycoside of stevia (stevioside) and its aglucone (steviol) were isolated …

Esterification with alcohols and diols of (4α, 8β, 13β)-13-methyl-16-oxo-17-norkaurane-18-
carboxylic acid chloride prepared by treatment of the acid (isosteviol) with thionyl chloride …

Acetylation with acetic anhydride of (4α, 8β, 13β)-16-hydroxy-13-methyl-17-norkaurane-18-
carboxylic acid and its methyl ester, obtained by reduction of isosteviol and (4α, 8β, 13β)-18 …

Abstract (4α, 8β, 13β)-13-Methyl-16-oxo-17-norkaurane-18-carboxylic acid (isosteviol) and
its methyl ester were reacted with benzylamine and hydroxylamine to obtain the …

Acylation of amino alcohols with isosteviol chloride, depending on the reactant ratio, leads to
formation of either bis-isosteviol derivatives or N-acylation products. Reactions of aromatic …

Steviol reacted with benzyl bromide and 1, 9-dibromononane in the system KOH-DMSO to
give the corresponding O-alkylation products at the carboxy group. The reaction of steviol …

A new diterpene derivative, 18-succinyloxyabieta-8, 11, 13-triene, was isolated from the
acidic fraction of the extract from wood greens of a Siberian fir. The chemical structure of the …

Raw material of Senecio viscosus L.(Compositae) first yielded the pyrrolizidine alkaloid
senecionine in 0.06–0.075% yield [1] and then the alkaloids squalidine and SF were …