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Homocyclotirucallane and two dihydrophenanthrenes from Spiranthes sinensis
1National Research Institute of Chinese Medicine, Taipei, Taiwan. yllin@cma23.nricm.edu.tw
Chemical & Pharmaceutical Bulletin
|September 18, 2001
Abstract:
A novel homocyclotirucallane, sinetirucallol (1), and two additional new dihydrophenanthrenes, sinensols G (2) and H (3), were isolated from the aerial parts of Spiranthes sinensis (Pers.) Ames. Their structures were determined by various spectral analyses, including MS and two-dimentional nuclear magnetic resonance techniques. The structure of compound 1 was further confirmed by single-crystal X-ray analysis. The absolute configuration of 1 was determined by modified Mosher's method.