The methanolic extract from a Chinese endemic Chrysanthemum plant, Dendranthema indicum var. aromaticum, was found to show high antifeeding activity against Pieris brassicae L., and by bioassay-guided separation, the active component, B-ring-homo-tonghaosu, 2-(2',4'-hexadiynylidene)-1,6-dioxaspiro-[4,5]-dec-3-ene (2) was isolated. Its structure was elucidated by comparing its spectroscopic data with those of 2 reported in the literatures. Furthermore new convenient total synthesis methods of B-ring-homo-tonghaosu were also developed to confirm its structure and make its further application in crop protection available. In addition, extensive comparison of spectroscopic data showed that the structure of compound 21 reported in literature should be revised to 2.
1.Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Bioorgan & Nat Prod Chem, Shanghai 200032, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, State Key Lab Phytochem & Plant Resources W China, Kunming 650204, Yunnan, Peoples R China 3.S China Agr Univ, Lab Insect Toxicol, Guangzhou 510642, Guangdong, Peoples R China
Recommended Citation:
Li, C; Yin, BL; Xu, HH; Chiu, MH; Wu, YL.Study on tonghaosu and its analogs: Isolation, structure identification and synthesis of antifeedant B-ring-homo-tonghaosu,CHINESE JOURNAL OF CHEMISTRY,2004,22(1):92-99
