Rzedowskia tolantonguensis

In general, very little has been written about diterpenes from the Latin American Celastra-ceaeas these structures are not often found. Abietriene type diterpenes have been the general rule in the Celastraceae although the chemical study of the minor constituents of Orthosphenia mexicana and Rzedowskia tolantonguensis did enable pimarane type diterpenes to be isolated and chemically characterized [43,45] and the second of these species afforded a series of new diterpenes with an isopimarane skeleton, described for the first time in the Celastraceae. 

A possible biogenetic route to triterpene quinones with an extra double bond (e.g., netzahualcoyone and derivatives) may involve dehydrogenation and subsequent pristimerin regrouping. Indeed, (Table V) two epimeric di-triterpene quinone ethers umbelatin a and p (118,119) have been isolated from the roots of Rzedowskia tolantonguensis [68]. The structures of pristimerin and netzahualcoyone were ascertained by the standard spectral methods. The H... 

O.m. Orthosphenia mexicana Stand Leg. R.t. Rzedowskia tolantonguensis Med. M.b. Maytenus boaria Mol. 

C32H37NO10 M 595.645 Alkaloid from the root bark of Rzedowskia tolantonguensis (Celastraceae). Mp 114-116°. Rzedowskia is not a generally recognised genus. 

Compd. not named in the paper. Constit. of roots of Rzedowskia tolantonguensis. [a] —143.6° (CHCI3). 4-Epimer [121688-16-2]. 

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