A-Amyrin, acetate

Partial Synthesis of a-Amyrin Acetate Proof of the Structure and Stereochemistry... 

A few reagents have been reported for the allylic oxidation of particular substrates. These include N bromosuccinimide oxidation of a-amyrin acetate in moist dioxane (equation 53), a method later modified by Thomson. 

P-Sitosterol and stigmasterol are the common steroids in the genus. So far only few common triterpenes such as friedelin (207), e/ /-fnedelinol (208), a-amyrin (204), P-amyrin (205), a-amyrin acetate (206), taraxasterol (213), lupeyl acetate (209), magnificol (210) were isolated from Tanacetum species. However, T. sinaicum afforded unusual new malabaricane type triterpenoids 3p-acetoxymalabarican-14(26),17E,21-triene (211) and 3-oxo-malabarica-14(26),17E,21-triene (212) (Table 1). 

From B. tricuneata collected in the surroundings of Santafe de Bogota (Colombia), several triterpenoids, e.g. p-sitosterol, a-amyrin acetate, friedelin, Fig. (25) and ursolic acid, Fig. (26) were also reported [59], while the species B. coridifolia yielded schottenol glucoside, Fig. (27), uvaol, Fig. (28) and ursolic acid, Fig. (26) [60],... 

Glutinone, fernenone, lupenone, simiarenol, a-amyrin acetate, p-amyrin acetate, ethyl palmitate, ethyl oleate, ethyl linoleate, lupenyl acetate, 24-methylene-cycloartanone, trans-phenyllitaconic, gult-5-en-3p-yl acetate, dammara-20,24-dien-3p-yl acetate, cycloartenyl acetate, cycloart-23-en-3p,25-diol, cycloart-23-en-3p,25-diol monoacetate, arteminolides... 

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