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Twelve new megastigmane sesquiterpenoids, wilsonols A-L (1-12), were isolated from the leaves of Cinnamomum wilsonii, along with seven known analogues (13-19). The structures of compounds 1-12 were established by spectroscopic analyses. The absolute configurations of 1-5 were determined by single-crystal X-ray diffraction analysis with Cu Kα irradiation,(More)
Fifteen new ent-kaurane diterpenoids, compounds 1-15, and two known analogues, 4-epi-henryine A (16) and leukamenin E (17), were isolated from the whole plants of Salvia cavaleriei. The structures of the new compounds were established by spectroscopic methods, and their absolute configurations were determined by electronic circular dichroism and(More)
A new diterpene with an unprecedented carbon skeleton, micranthanone A (1), two new grayanane diterpenoids bearing an unusual 5,6-(3,4-dihydroxylbenzylidene acetal) motif, rhodomicranols A (2) and B (3), and three known grayanane diterpenoids (4-6) were isolated from Rhododendron micranthum. Their structures were elucidated by spectroscopic analyses,(More)
Three new diterpenoids with unprecedented carbon skeletons, cinncassiols F (1) and G (2) and 16-O-β-D-glucopyranosyl-19-deoxycinncassiol G (3), a new isoryanodane diterpenoid, 18-hydroxyperseanol (4), six known isoryanodane diterpenoids, 5-10, and a known ryanodane diterpenoid, 11, were isolated from the stem bark of Cinnamomum cassia. Compound 1 possesses(More)
Latent O-glycosides, 2-(2-propylthiol)benzyl (PTB) glycosides, were converted into the corresponding active glycosyl donors, 2-(2-propylsulfinyl)benzyl (PSB) glycosides, by a simple and efficient oxidation. Treatment of the PSB donor and various acceptors with triflic anhydride provided the desired glycosides in good to excellent yields. The leaving group,(More)