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. 2003 Apr;51(4):415-7.
doi: 10.1248/cpb.51.415.

Tetracyclic triterpenoids from the leaves of Azadirachta indica and their insecticidal activities

Bina Shaheen Siddiqui  1 , Farhana Afshan, Tahsin Gulzar, Razia Sultana, Syed Naeemul-Hassan Naqvi, Rajput Mohammad Tariq
Affiliations
Free article

Tetracyclic triterpenoids from the leaves of Azadirachta indica and their insecticidal activities

Bina Shaheen Siddiqui et al. Chem Pharm Bull (Tokyo). 2003 Apr.
Free article

Abstract

A new tetranortriterpenoid, meliatetraolenone [24,25,26,27-tetranor-apotirucalla-(apoeupha)-6alpha-O-methyl, 7alpha-senecioyl(7-deacetyl)-11alpha,12alpha,21,23-tetrahydroxy-21,23-epoxy-2,14,20(22)-trien-1,16-dione] (1) was isolated from the methanolic extract of fresh leaves of Azadirachta indica along with the known compound odoratone (3) which was hitherto unreported from this source. Their structures have been elucidated by spectral studies including 2D NMR. The insecticidal activities of 1 as well as those of odoratone (3) are reported. 1 and odoratone both showed mortality on fourth instar larvae of mosquitoes (Anopheles stephensi) with LC(50) values of 16 and 154 ppm, respectively.

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