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KMID : 0043319910140020160
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Archives of Pharmacal Research
1991 Volume.14 No. 2 p.160 ~ p.164
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The Chiroptical Properties and Absolute Configuration of 28-nor-beta-amyrins
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Woo WS
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Abstract
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The existence in nature of two isomers of 28-nortriterpenes is known. One is normal D/E cis form and the other is 17alpha-hydrogen D/E trans form. Since the latter cannot exist with ring D in the chair conformation, the chiroptical method is not applicable to determination of the absolute configuration. The stereochemical assignment would now be made by NMR data. Conformation of this view could be provided by the synthesis of 3beta, 21beta-dihydroxy-16-keto-28-nor-17alpha, 18beta-olean-12-ene as a model compound.
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KEYWORD
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