TRITERPENOIDS FROM ABIES SP .17. DETECTION OF STEREOSELECTIVE ETHYLIDENATION OF RING-A ON THE ALKALI FRAGMENTATION OF 3,23-DIOXO-7,24-LANOSTADIEN-26-OIC ACIDS

Authors
GRISHKO VV SHAKIROV MM BAGRYANSKAYA IY GATILOV YV RALDUGIN VA
Citation
Vv. Grishko et al., TRITERPENOIDS FROM ABIES SP .17. DETECTION OF STEREOSELECTIVE ETHYLIDENATION OF RING-A ON THE ALKALI FRAGMENTATION OF 3,23-DIOXO-7,24-LANOSTADIEN-26-OIC ACIDS, Russian chemical bulletin, 45(3), 1996, pp. 713-716
Citations number
6
Categorie Soggetti
Chemistry
Journal title
Russian chemical bulletin → ACNP
ISSN journal
10665285
Volume
45
Issue
3
Year of publication
1996
Pages
713 - 716
Database
ISI
SICI code
1066-5285(1996)45:3<713:TFAS.D>2.0.ZU;2-X
Abstract
3,23-Dioxo-7,24-lanostadien-26-oic acids, components of a natural mixt ure of triterpenoids from Siberian fir needles, undergo fragmentation of the side-chain as well as condensation with piruvic acid formed in the reaction in boiling alcoholic alkali and give the 2-ethylidene der ivative of the fragmentation product; the structure of the latter was established by NMR spectra and supported by X-ray analysis of its phot oisomerization product.