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Three new insecticidal sesquiterpene pyridine alkaloids from Celastrus angulatus
Ji Zhiqing1, Zhang Qidong, Shi Baojun
1Department of Plant Protection, Northwestern Agricultural University, Yangling, Shaanxi, People's Republic of China.
Abstract:
Three new sesquiterpene pyridine alkaloids with a beta-dihydroagarofuran sesquiterpene skeleton, celangulatin G(1), H(2) and I(3), and one known alkaloid 4 were isolated from the middle-polar extracts of the root bark of Celastrus angulatus by bioassay-guided separation. Their chemical structures were elucidated mainly by the analyses of the MS and NMR spectral data. Celangulatin G(1), H(2), I(3) and 4 showed KD(50) against Mythimna separata were 849.61, 80.24, 96.29 and 50.98 microg g(-1), respectively.