| Structure Identification: |
| Chem Pharm Bull (Tokyo). 2000 Apr;48(4):496-504. | | Methyl quadrangularates A-D and related triterpenes from Combretum quadrangulare.[Pubmed: 10783068] |
METHODS AND RESULTS:
From the MeOH extract of leaves of Combretum quadrangulare, fifteen new cycloartane-type triterpenes, methyl quadrangularates A-D (1-4) and N-P (8, 6, 12), methyl 24-epiquadrangularate C (5), quadrangularic acid E (9), 23-deoxojessic acid (10), 1-O-acetyl-23-deoxojessic acid (11), quadragularols A (7) and B (13) and norquadrangularic acids B (14) and C (15) were isolated together with two known cycloartane-type triterpenes, methyl 23-deoxojessate (16) and 4beta,14alpha-dimethyl-5alpha-ergosta-9beta++ +,19-cyclo-24(31)-en-3beta-hydroxy-4alpha-carboxylic acid (17). Betulinic acid (18), beta-sitosterol (19), kamatakenin (20), isokaempferide (21), 5,7,4'-trihydroxy-3,3'-dimethoxyflavone (22) and 5,4'-dihydroxy-3,7,3'-trimethoxyflavone (23) were also obtained from the same extract. The structures of the new compounds were elucidated on the basis of spectral analysis and chemical conversions.
CONCLUSIONS:
All the isolated compounds were tested for their cytotoxicity towards highly liver metastatic murine colon 26-L5 carcinoma cells, and the cycloartane-type triterpenes showed various degrees of cytotoxicity, whereas all the flavonoids possessed strong cytotoxicity with ED50 values equal to or less than 6 microM. |
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