Carbon-13 nmr spectra of some furanosesquiterpenes, major components of

Sesquiterpenoids from the Root Tubers ofLindera aggregata

“…The 13 C and DEPT-135 NMR spectra revealed fifteen carbon signals, including two methyls (both of them bonded to C=C), three methylenes, four methines (including three oxygenated methines and an endocyclic double bond methine), and six quaternary carbons (including one oxygen-bearing quaternary carbon, two carbonyl carbons, and three double bond quaternary carbons). All of the above information suggested that compound 1 was a germacrane-type sesquiterpenoid [8][9][10], which was further supported by the following analysis. The 1 H-1 H COSY spectrum revealed two spin systems H-1, H 2 -2, and H 2 -3, and H-8 and H 2 -9 (l " Fig.…”

“…3). Based on ESI-MS, NMR, optical rotation data, and comparison with reported data, the known isolated compounds were determined as linderanine C (6) [8], linderanine A (7) [8], linderanine B (8) [8], linderane (9) [8,11], (+)-linderadine (10) [14], linderalactone (11) [10], ent-4(15)-eudesmene-1β,6α-diol 13 [15], hydroxylindestrenolide 14 [16], and dehydrocostuslactone 15 [17]. Among these, compounds 6-8, 10, 13, and 15 were isolated as secondary metabolites from the title plant for the first time.…”

Paeoveitols A–E from Paeonia veitchii

“…This assumption was evidenced by the sequential showed ten carbon resonances, assigned to five quaternary carbons, three methines, one methylene and one methyl. By comparison with 3,6-dimethyl-5-hydroxybenzofuran [31], compound 4 possessed an additional hydroxymethyl unit instead of the methyl moiety at C-1′, which was further supported by the correlations of δ H 4.66 (H-1′) to δ C 143.3 (C-2), 121.6 (C-3) and 126.6 (C-9) and δ H 7.53 (H-2) to δ C 55.8 (C-1′) in the HMBC experiment. Accordingly, the structure of compound 4 was characterized as shown in Fig.…”

Sesquiterpenes and Alkaloids from Lindera chunii and Their Inhibitory Activities against HIV-1 Integrase.

“…From the root of L. chunii we isolated 20 compounds, including three new compounds called lindenanolides E (1), F (2) and G (3), new naturally occurring lindenanolide H (4), 5) two new aporphine alkaloids called lindechunines A (18) and B (20), six known sesquiterpenes: pseudoneolinderane (5), 6) lindeneol (6), 7) lindeneyl acetate (7), 7) lindera lactone (8), 7) strychinstenolide 6-O-acetates A (9) and B (10), 8) and eight known aporphine alkaloids: hernandine (11), 9) hernangerine (12), 9) ocokryptine (N-methylhernandine) (13), 10) hernandonine (14), 11) N-methylhernangerine (15), 12) laurolistine (norboldine) (16), 13) 7-oxohernangerine (17) 14) and 7-oxohernagine (19) 14) (Chart 1). The structures of known compounds were determined by comparing their spectral data with those of authentic samples or previously reported data.…”