1982
DOI: 10.1016/0031-9422(82)80143-x
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Kolavane and kaurane diterpenes from the stem bark of Xylopia aethiopica

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Cited by 75 publications
(52 citation statements)
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“…12 and 13-hydroxy-cis-ent-cleroda-3,14-diene 13 (δ 33.6 and 33.0, respectively). In contrast, the trans-clerodane diterpenes 2-oxokolavenic acid 10 and eremone 11 presented chemical shifts for this methyl carbon at δ 19.5 and 18.8, respectively. In clerodane diterpenes with a cis configuration between methyl groups C-17 and C-20, such as hautriwaic acid 11 , 2-oxokolavenic acid 10 and floridiolic acid 12 , the chemical shift of C-20 was observed at approximately δ 18.0, whilst clerodane diterpenes with a trans configuration between these methyl groups, as in the casearins and casearvestrins [5][6][7][8][9] In the positive-ion mode, the HRTOF-ESIMS of compound 2 exhibited an [M+H] + ion at m/z 317.2117, compatible with a molecular formula of C 20 H 28 O 3 , which was confirmed by the finding of [M+Na] + ion at m/z 339.1963.…”
Section: Resultsmentioning
confidence: 89%
See 1 more Smart Citation
“…12 and 13-hydroxy-cis-ent-cleroda-3,14-diene 13 (δ 33.6 and 33.0, respectively). In contrast, the trans-clerodane diterpenes 2-oxokolavenic acid 10 and eremone 11 presented chemical shifts for this methyl carbon at δ 19.5 and 18.8, respectively. In clerodane diterpenes with a cis configuration between methyl groups C-17 and C-20, such as hautriwaic acid 11 , 2-oxokolavenic acid 10 and floridiolic acid 12 , the chemical shift of C-20 was observed at approximately δ 18.0, whilst clerodane diterpenes with a trans configuration between these methyl groups, as in the casearins and casearvestrins [5][6][7][8][9] In the positive-ion mode, the HRTOF-ESIMS of compound 2 exhibited an [M+H] + ion at m/z 317.2117, compatible with a molecular formula of C 20 H 28 O 3 , which was confirmed by the finding of [M+Na] + ion at m/z 339.1963.…”
Section: Resultsmentioning
confidence: 89%
“…In the positive-ion mode, the HRTOF-ESIMS of 1 exhibited an [M+Na] + ion at m/z 329.2481 that was compatible with a molecular formula of C 20 H 34 O 2 . Analysis of the PND and DEPT 135º 13 C-NMR spectra of 1 revealed twenty signals similar to those of the clerodane diterpene skeleton [6][7][8][9][10][11] , being five of them attributed to methyl groups: C-16 (δ 19. 12 and 13-hydroxy-cis-ent-cleroda-3,14-diene 13 (δ 33.6 and 33.0, respectively).…”
Section: Resultsmentioning
confidence: 99%
“…The methanolic extract of the fresh fruits of A. cherimola was subjected to MCI gel CHP20P, octadecyl silica gel (ODS), and silica gel column chromatographies and finally to HPLC to obtain twelve compounds (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) H COSY spectrum revealed connectivities of three partial structures, a (C-1-C-3), b (C-5-C-7), and c (C-9 and C-11-C-17) as shown in Fig. 1.…”
Section: Resultsmentioning
confidence: 99%
“…A .+ ) revelado pelo espectro de massas e comparação dos deslocamentos químicos dos átomos de carbono (δ C ) e hidrogênio(δ H ) com valores descritos na literatura 6,7 permitiram a identificação desta substân-cia natural como ácido ent-caur-16-en-19-óico (1). Este diterpeno (1) foi isolado anteriormente desta espécie4.…”
Section: Resultsunclassified