[Untitled]

Authors :: Leonard M. Khalilov
I. V. Galyautdinov
S. R. Nazmeeva
Rimma G. Savchenko
V. N. Odinokov
Source :: Russian Journal of Organic Chemistry. 38:525-529
Publication Year :: 2002
Publisher :: Springer Science and Business Media LLC, 2002.
Abstract: Ozonolysis of 2,3:20,22-diacetonides of 24.25-and 25,26-anhydro-20-hydroxyecdysones afforded the corresponding ω-carbonyl derivatives. The hydrogenation of the mentioned dehydration products of 20-hydroxyecdysone acetonide yielded diacetonide of ponasterone A that provided ponasterone A and its 29,22-acetonide at hydrolysis.