Saxifraganoids A and B, two novel cucurbitane triterpenoid glycosides from Saxifraga umbellulata var. pectinata

Novel Cucurbitane Triterpenes from the Tubers of Hemsleya amabilis with Their Cytotoxic Acitivity

“…Furthermore, HMBC correlations of H-6 with C-5 (δ C 168.3) and C-7 (δ C 200.3), H 3 -26 with C-24 (δ C 129.0), C-25 (δ C 139.3), and C-27 (δ C 61.2) implied an α, β-unsaturated carbonyl moiety at C-5/6/7, double bond at C-24/25, and hydroxymethyl at C-27. Long-range correlations between δ H 3.25 (1H, m, H-12a) and C-11 (δ C 211.5) in the HMBC spectrum indicated that the hydroxy group at C-11 in the reported ones has been replaced by a carbonyl group in compound 1 [15,16]. C-15 was linked with C-23 through an O atom on the basis of the correlations from the proton signals at δ H 5.17 (1H, m, H-16) to C-23 (δ C 70.8) and δ H 5.10 (1H, m, H-23) to C-16 (δ C 70.9).…”

Natural Sesquiterpenoids, Diterpenoids, Sesterterpenoids, and Triterpenoids with Intriguing Structures from 2017 to 2022

“…Among them, three systematic reviews have covered the published data on triterpenoids isolated from all organisms from 2013 to 2015. [ 145‐147 ] In recent years, many triterpenoids have been reported with unusual tetracyclic, [ 148‐153 ] pentacyclic, [ 149,154‐158 ] and a few tricyclic ring systems. [ 159‐162 ] Among them, a series of dimers bearing different scaffold have been designed and synthesized, and their anti‐HCV entry activities have also been evaluated.…”

Natural Sesquiterpenoids, Diterpenoids, Sesterterpenoids, and Triterpenoids with Intriguing Structures from 2017 to 2022

“…Among them, three systematic reviews have covered the published data on triterpenoids isolated from all organisms from 2013 to 2015. [136][137][138] In recent years, many triterpenoids have been reported with unusual tetracyclic, [139][140][141][142][143][144] pentacyclic, [140,[145][146][147][148][149] and a few tricyclic ring systems. [150][151][152][153] Among them, a series of dimers bearing different scaffold have been designed and synthesized, and their anti-HCV entry activities have also been evaluated.…”