Triterpenoids

This review covers the isolation and structure determination of triterpenoids including squalene derivatives, lanostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, uranes, hopanes, isomalabaricanes and saponins. The literature from January to December 2004 is reviewed and 243 references are cited.     

Triterpenoids

This review covers the isolation and structure determination of triterpenoids including squalene derivatives, lanostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, isomalabicanes and saponins. The literature from January to December 2000 is reviewed and 277 references are cited.     

Triterpenoids

This review covers the isolation and structure determination of triterpenoids including squalene derivatives, lanostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, fernanes, sipholanes, isomalabaricanes, serratanes and saponins The literature from January to December 2001 is reviewed and 242 references are cited.     

Triterpenoids

This review covers the isolation and structure determination of triterpenoids, including squalene derivatives, protostanes, lanostanes, holostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, serratanes and saponins; 305 references are cited.     

Triterpenoids

This review covers the isolation and structure determination of triterpenoids, including squalene derivatives, protostanes, lanostanes, holostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, serratanes and saponins; 278 references are cited.     

Triterpenoids

This review covers the isolation and structure determination of triterpenoids including squalene derivatives, protostanes, lanostanes, holostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, isomalabaricanes and saponins. The literature from January 2005 to December 2006 is reviewed and 478 references are cited.     

Triterpenoids fromAbies species

A new component, namely, the cyclic tautomer of previously unknown (24Z)-3, 23-dioxolanosta-8,24-dien-26-oic acid, was isolated from the acidic fraction of the extract from Siberian fir needle. The structure of the title compound was established based on the¹H NMR and circular dichroism spectra.     

Triterpenoids fromAbies species

Four new compounds were identified in a mixture of tetracyclic methyl ketones obtained by alkaline cleavage of acids of Siberian fir needles. Two of them correspond to natural acids of the 17,13-fridolanostane series of yet unknown structure.For Part 19, see Ref. 1.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2997–2999, December, 1996.     

Triterpenoids fromAbies species

Norrish (type II) photochemical fragmentation of 25,26,27-trinor-17,14-frido-9β-lanostane 23-ketone was performed to give the 17α-vinyl derivative, a promising intermediate for the synthesis of 4,4-dimethyl-9β-steroid derivatives. For Part 23, see Ref. 1. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1401–1402.     

Triterpenoids fromAbies species

The structure and the absolute configuration of 25,26,27-trinor-17,13-frido-9β-lanostane hydroxyketonep-bromobenzoate were established by X-ray structural analysis. This compound readily forms a 1∶1 crystal solvate withn-pentane.     

Triterpenoids fromAbies species

Two new lanostane lactones were isolated from a neutral part of an ethereal extract of dried needle-free shoots of Siberian fir. Their structures were proposed based on comparison of their¹³C and¹H NMR spectra with the spectra of known triterpenoid lactones with similar structures. For Part 22, see Ref. 1. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2064–2066, October, 1998.