3 years ago

Syntheses of (−)-Tripterifordin and (−)-Neotripterifordin from Stevioside

Syntheses of (−)-Tripterifordin
and (−)-Neotripterifordin
from Stevioside
Asako Kawabata, Yoshiki Hamada, Shoji Kobayashi, Araki Masuyama, Keisuke Shibukawa, Takuma Kuruma
We report short syntheses of (−)-tripterifordin and (−)-neotripterifordin, potent inhibitors of HIV replication, from stevioside, a natural sweetener used worldwide. The key transformations are reduction at C13 through the formation of a tertiary chloride and subsequent three-step lactonization including a selective iodination at C20 by the photoreaction of the C19-alcohol. The title compounds were reliably obtained from stevioside in 9 and 11 steps (with 5–7 isolation steps), respectively. Additionally, the related lactone-containing ent-kaurenes, doianoterpenes A and B, and two more natural products were synthesized.

Publisher URL: http://dx.doi.org/10.1021/acs.joc.7b02916

DOI: 10.1021/acs.joc.7b02916

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