Two new triterpenes from the seeds of Trichosanthes cucumeroides |
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Authors: | Chao Zhimao Shibusawa Yoichi Yanagida Akio Shimotakahara Sakurako Shindo Heisaburo |
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Institution: | Institute of Chinese Materia Medica, China Academy of Traditional Chinese Medicine, 16 Dongzhimennei Nanxiaojie, Dongcheng, Beijing 100700, China. chaozhimao@sina.com |
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Abstract: | Two new triterpenes named 7-oxodihydrokarounitriol (1) and 7,11-dioxodihydrokarounidiol (2), and one known triterpene, 7-oxodihydrokarounidiol (3), were isolated from the unsaponifiable matter of the seeds of Trichosanthes cucumeroides. The structures of 1 and 2 were elucidated as (3alpha, 11beta, 13alpha, 14beta, 20alpha)-3,11,29-trihydroxy-13-methyl-26-norolean-8-ene-7-one, and (3alpha,13alpha,14beta,20alpha)-3,29-dihydroxy-13-methyl-26-norolean-8-ene-7,11-dione on the basis of extensive NMR (1H, 13C, 1H-1H COSY, DEPT, HMQC, HMBC and NOESY) and MS studies. |
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