Normethyl pentacyclic and lanostane-type triterpenes from Adiantum venustum

Isolation and Characterization of Phytochemicals From Stem Bark of Cassia Fistula Linn.

“…In the proton NMR spectrum ( ppm, CDCl3) the presence of six tertiary methyl groups were observed at 0.74 (s, 3H, C-27), 0.76 (s, .00 (C-28) and 19.30 (C-30) and their assignment has been done accordingly as shown in parentheses. These spectral data are in good agreement with those reported for lupeol in the literature [13][14][15] . On the basis of these observations compound B was identified as lupeol.…”

“…The chemical shift and coupling constant J =5.60 Hz of methine proton supported β-orientation of hydroxyl (-OH) group at C-3 position. Absorption at 72.00 in13 C NMR spectrum (δ ppm, CDCl3) also confirmed the presence of hydroxyl group at C-3 position. Olefinic carbon atoms were confirmed by the absorptions at 140.00 and 122.10 which were assigned to C-5 and C-6 carbon atoms respectively.…”

Constituintes químicos e avaliação do potencial alelopático de Adiantum tetraphyllum Humb. & Bonpl. Ex. Willd (Pteridaceae)

“…O conjunto de sinais em δ C entre 14,2 e 42,0 foram atribuídos aos carbonos metilênicos e metílicos do triterpenóide, distinguidos pelo espectro de DEPT 135°, assim como os cinco sinais em δ C entre 48,9 e 56,0, correspondentes a carbonos metínicos, indicando que a substância 1 era um triterpenóide pentacíclico. A comparação com dados da literatura 12 , confirmou uma perfeita correlação de δ C de 1 com a 30-normetil-lupan-20-ona.…”

Triterpenoids

“…52 Other new lanostane derivatives include centauriol 59 and centaurione 60 from Centaurium pulchellum, 53 four trinorlanostanes 61-64 from Pinus luchuensis, 54 three 4α,14αdimethylergostane derivatives 65-67 from Euphorbia chamaesyce 55 and adiantulasterol 68 from Adiantum venustum. 56 Eryloside F is a disaccharide of penasterol 69, isolated from the marine sponge Erylus formosus. 57 It is a potent thrombin receptor antagonist and inhibits human platelet aggregation in vitro.…”

“…125 Other new lupanes include lupan-20-ol 218 from the fern Polypodiodes amoena, 126 isoceanothic acid 219 from Zizyphus xylopyrus, 127 bacosine 220 from Bacopa monniera, 128 3β-hydroxylup-18-en-21-one 221 from Taraxacum officinale 129 and adiantulupanone 222 from Adiantum venustum. 56 Other new lupane saponins include quadranosides I 223 and II 224 130 and XI 225 131 from the seeds of Combretum quadrangulare, glycoside L-I 1 226 from Schlefferopsis angkae 132 and bourneisosides A and B from Lonicera bournei. 133 The 1 H and 13 C NMR shifts of 11α-hydroxylup-20(29)-en-3-one have been assigned.…”