A series of A-ring azepanones and azepanes derived from betulonic, oleanonic and ursonic
acids was synthesized and evaluated for their in vitro antimycobacterial activities against M …

This paper describes an access to new nitrogen-containing heterocyclic triterpenoids by the
reaction of 2, 3-indolotriterpenoids with ozone and dimethyldioxirane. The oxidation of …

Plant-derived natural products (plant secondary metabolites) are an inexhaustible source for
the new bioactive substances due to the large structural diversity and a broad spectrum of …

A series of new steroidal peroxides–3′-trifluoromethylated 1, 2, 4-trioxolanes and 1, 2, 4, 5-
tetraoxanes based on deoxycholic acid were prepared via the reactions of the Griesbaum …

28-Oxo-allobetulone derivatives that were newly synthesized or prepared earlier by
modification of ring A (3-and 4-pyridylidene, furfurylidene, azepane, lactam, quinolone …

In the current study a late-stage diversification of unactivated olefins labd-8 (17)-en-15-oic
acid (1a) and methyl labd-8 (17)-en-15-oate (1b) via Heck-Matsuda arylation is described …

New synthetic methods to prepare seven-membered heterocyclic compounds containing
one, two, or three of the heteroatoms N, O or S are covered. Aromatic systems containing at …

The first oxidative transformations of 3β-acetoxy-21β-acetyl-20β, 28-epoxy-18α, 19β H-
ursane at the 21β-acetyl reaction center were performed. Ursane-type 1, 2, 4, 5-tetraoxanes …

Актуальность темы. Пентациклические тритерпеноиды успешно зарекомендовали
себя в качестве перспективных структурных платформ для получения биологически …