Three New Tetranortriterpenoids from Neem Seed Oil
作者:Gurulingappa Hallur、Apoorba Sivramakrishnan、Sujata V. Bhat
DOI:10.1021/np0105174
日期:2002.8.1
Three new tetranortriterpenoids, 1alpha,2alpha epoxy 17beta hydroxyazadiradione (1), 1alpha,2alpha epoxymmolicinol (2), and 7 deacetylnimolicinol (3), have been isolated from a methanol extract of neem oil (Azadirachta indica, seed oil) along with the known compounds epoxyazadiradione, 17beta hydroxyazadiradione, gedunin, nimbin, and nimolicinol (4) Spectral studies and chemical transformations were used to establish the structure of compounds 1-3 The characterization of the epoxides 1 and 2 in neem oil is of biogenetic significance, as they may be considered as intermediates between A ring enones and 1,3 diols among the A indica tetranortriterpenoids.
Susceptibility of<i>Aedes aegypti</i>and<i>Culex quinquefasciatus</i>Larvae to Gedunin-Related Limonoids
作者:Hallur Gurulingappa、Vrushali Tare、Pushpa Pawar、Vijay Tungikar、Yogesh R. Jorapur、Sriram Madhavi、Sujata V. Bhat
DOI:10.1002/cbdv.200800105
日期:2009.6
The major non-azadirachtin limonoids such as gedunin (1), epoxyazadiradione (3), nimbocinol (4), and nimolicinol (5) from Azadirachta indica A. Juss ('neem') and their derivatives were evaluated for their toxic action against fourth instar larvae of Aedes aegypti L. and Culex quinquefasciatus Say. Gedunin exhibited 100% toxic action against both the mosquito larvae at 50 and 10 ppm. Epoxyazadiradione