3-oxo-20S,24R-epoxy-dammarane-25ξ,26-diol from Mangifera indica

New Dammarane Triterpenes from the Aerial Parts of Ibicella lutea Grown in Argentina

“…3 (d), and this is consistent with the data reported for 24R* isomers. 7,10 This fact was substantiated by the NOESY cross-peak between the signal of H-24 and the protons of Me-21. In an analogous fashion, a 20S* relative stereochemistry was established by the strong NOESY correlation between the protons of Me-21 and H-17 and this, in turn, with the protons of Me-30.…”

Plant Resources, 13C-NMR Spectral Characteristic and Pharmacological Activities of Dammarane-Type Triterpenoids

“…In order to complete and enrich the resource investigation of DTT, we summarize the literatures (1965–2016) describing this type of triterpenoids, extracted from various botanicals. In Table 1, 136 species, from Araliaceae, Cucurbitaceae, Rhamnaceae, and Meliaceae families, together with 42 others are summarized [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,…”

Stereochemistry of 2,2,5‐trisubstituted tetrahydrofuran ring‐containing natural products based on 1H NMR spectroscopy: some observations

“…About 100 dammaranes, which contain a THF ring in the side chain, are found in the literature . These are often referred to as ocotillone‐type dammaranes.…”

“…Several natural products belonging to various classes like quassiols, squalene‐derived polyethers from red algae, malabaricane‐type triterpenoids, dammarane‐type triterpenoids, and miscellaneous contain 2,2,5‐trisubstituted tetrahydrofuran (THF) rings in their structures. In most cases, it is hydrogen on one side and a methyl group on the other, creating two stereocenters on the THF ring and necessitating the assignment of their configuration.…”