Abstract
Selective transformations of available phytoecdysteroids to access minor ecdysteroids and some new their structural analogs are reviewed. Among them are the one-step transformation of ecdysteroids into 2-dehydro-3-epi-ecdysteroids by oxidation with ozone in pyridine, and the catalytic hydrogenation of ecdysteroids, including conjugated diene ones under basic conditions. 7,8α-Dihydro- and 7,8α-dihydro-14α-deoxyecdysteroids were synthesized by these methods. 9α,14α-Epoxyecdysteroids with the oxetane cycle in the C ring were obtained for the first time. The acid-catalyzed rearrangement of 9α,14α-epoxyecdysteroids gave 9α,13α-epoxy derivatives with the 18-methyl group migrated to the 14β-position.
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