Tetrahedron Letters p. 361 - 362 (1989)
Update date:2022-08-05
Topics:
Tsuda, Yoshisuke
Kiuchi, Fumiyuki
Liu, Hong-Min
The strucuture of gymnemagenin, the sapogenin of antisweet principle of Gymnema syrvestre, was firmly established as 3β,16β,21β,22α,23,28-hexahydroxy-olean-12-ene by the X-ray analysis of the 3β,23;21β,22α-di-O-isopropylidine derivative.On the basis of this result, the structure of deacylgymnemic acid was elucidated as the 3-O-β-glucuronide by comparison of the 13C-NMR spectra.
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