69393-95-9Relevant academic research and scientific papers
Anti-osteoporotic and antioxidant activities of chemical constituents of the aerial parts of Ducrosia ismaelis
Morgan, Abubaker M.A.,Lee, Hyun Woo,Lee, Sang-Hyun,Lim, Chi-Hwan,Jang, Hae-Dong,Kim, Young Ho
supporting information, p. 3434 - 3439 (2014/07/22)
A new pterocarpan glycoside, glycinol-3-O-β-d-glucopyranoside (1), and a new dihydrochalcone glycoside, ismaeloside A (2), were isolated together with 13 known compounds, including several flavonoids (3-8), lignans (9-11), and phenolic compounds (12-15), from the methanol extract of the aerial parts of Ducrosia ismaelis. The chemical structures of these compounds were elucidated from spectroscopic data and by comparison of these data with previously published results. The anti-osteoporotic and antioxidant activities of the isolated compounds were assessed using tartrate-resistant acid phosphatase (TRAP), oxygen radical absorbance capacity (ORAC), and reducing capacity assays. Compound 15 exhibited a dose-dependent inhibition of osteoclastic TRAP activity with a TRAP value of 86.05 ± 6.55% of the control at a concentration of 10 μM. Compounds 1, 3-5, and 8 showed potent peroxyl radical-scavenging capacities with ORAC values of 22.79 ± 0.90, 25.57 ± 0.49, 20.41 ± 0.63, 26.55 ± 0.42, and 24.83 ± 0.12 μM Trolox equivalents (TE) at 10 μM, respectively. Only compound 9 was able to significantly reduce Cu(I) with 23.44 μM TE at a concentration of 10 μM. All of the aforementioned compounds were isolated for the first time from a Ducrosia species.
Asymmetric total syntheses of (-)-variabilin and (-)-glycinol
Calter, Michael A.,Li, Na
, p. 3686 - 3689 (2011/09/14)
Total syntheses of (-)-variabilin and (-)-glycinol have been accomplished, using the catalytic, asymmetric "interrupted" Feist-Benary reaction (IFB) as the key transformation to introduce both stereogenic centers. A monoquinidine pyrimidinyl ether catalyst affords the IFB products in over 90% ee in both cases. Other key steps include an intramolecular Buchwald-Hartwig coupling and a nickel-catalyzed aryl tosylate reduction.
