Diterpenoid acids, (-)-cis- and (-)-trans-ozic acid, in wild sunflower, Helianthus occidentalis

Abstract

Communicationsservation possibly related to the fact that the high incidence of stomach cancer in Japan may be related to dietary factors (Marquardt et al., 1977).

Terpenoid Compositions of Resins from Callitris Species (Cupressaceae)

“…The communic acids have been characterized for resin from C. columellaris [21]. Ozic acid (XVII, 4- epi -communic acid, assumed 12E-isomer) was a dominant component in two samples, and its mass spectra (Figure 2i and Figure S1ii) were interpreted by comparison with literature data [37,38] and the GC retention indices versus those of the communic acids. Lambertianic acid (XXII) is a major component in most samples and its mass spectra (Figure 2k and Figure S1nn) were interpreted by comparison with a surrogate standard from resin of Pinus lambertiana [39].…”

Composição química de uma população de Croton gratissimus Burch (Euphorbiaceae)

“…Estes dados foram comparados com os dados da literatura de cada um dos compostos identificando o óxido de cariofileno (1), 6 1β-metoxicariolan-9β-ol (2), 14,15 ácido kaur-16-en-19-oico (3), 16 ácido cis-ozoico (4), 17,18 espatulenol (5), [19][20][21] lupeol (6), 22 7δ-metoxi-opposit-4(15)-en-1β-ol (7), 23,24 germacra-4(15),5,10(14)-trien-1β-ol (8), 25,26 β-sitosterol (9), 27 ent-kaur-16-en-18-ol (10), 16 ácido 15-metoxi-neo--clerodan-3,13-dien-16,15-olid-18-oico (11), [28][29][30] 6α-metoxieudesm--4(15)-en-1β-ol (12), 31 sacarose (13) 32 e a N-metil-trans-4-hidroxi-Lprolina (14) (Figura 1). 33 Estudos prévios sobre a Croton gratissimus focaram-se sobre as folhas.…”

“…Finalmente, a fração E, frações 43-59, foi cromatografada sob sílica gel (Hex-AcOEt, 1:0 → 0:1; ±100 mL; 103 frações) e as frações 29-30 foram purificadas por CF com sílica gel (Hex-AcOEt 1:0→0:1; ±100 mL; 60 frações), obtendo-se o composto 11 (12 mg; Hex-AcOEt 9:1; frações [17][18][19].…”

A Method for the Rapid Discovery of Naturally Occurring Products by Proteins Immobilized on Magnetic Beads and Reverse Affinity Chromatography

“…The 1 H– 1 H COSY spectrum, heteronuclear multiple bond correlations (HMBCs) and other spectral data of 3 revealed the presence of 12( Z )‐labda‐8(17),12,14‐trien‐18‐ol17, 18 and α‐arabinose19 (Figure 6). The configuration of the C12C13 double bond ( Z ) was determined by comparison of the signal pattern in the 13 C NMR spectra with those reported for cis ‐ and trans ‐methyl ozate 20. Acid hydrolysis of 3 was carried out to determine the absolute stereochemistry of the aglycone and sugar moieties of the compound.…”