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《Chemical Research In Chinese Universities》 1989-09
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Studies on the Chemical Components of Oxytropis Ochrocephala Bunge( Ⅲ )

Sun Rongqi, Jia Zhongjian, Cheng Dongliang, zhu Ziqing(Chu Tse-tsin)| (Institute of Organic Chemistry, Lanzhou University, Lanzhou)  
Two triterpenoid sapogenols Ⅰ and Ⅱ were obtained from the acidic hydrolysis products of the total saponin mixture of oxytropis ochrocephala bunge. Compound Ⅰ , the genuine sapogenol of the total saponin mixture, was identified as soyasapogenol B; compound Ⅱ , a new type artifact sapogenol, was determined to be olean-13(18)-ene-22a-chloro-33, 24-diol. We also isolated a minor saponin Ⅲ which was identified as 3-O-[β-D-glucopyranosyl(1→2)-β-D-glucuronopyranosyl] soyasapogenol B. This paper deals with the identification of compound Ⅰ , Ⅱ and Ⅲ , as well as the chemical transformations between them. The 13C NMR signals of compound Ⅰ and Ⅱ were also assigned by using 13C, 1H spin couplings and PRFT-13C NMR technique.
【Key Words】： Oxytropis Saponins Soyasapogenol B
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