Minor petuniasterones from Petunia hybrida

Add time:08/27/2019    Source:sciencedirect.com

Seven new steroids have been isolated from leaves and stems of Petunia hybrida. They are 30-hydroxy petuniasterone A (C-30 epimeric mixture), 1α-acetoxy-1,2-dihydropetuniasterone A (designated petuniasterone E), (22R,24S)-7α,24-dihydroxy-22,25-oxidoergosta-1,4-dien-3-one (petuniasterone F), C-24 epimers of (22R)-7α,22,24,25-tetrahydroxyergosta-1,4-dien-3-one (petuniasterones G1 and G2 and C-24 epimers of (22R)-1-α-acetoxy-7α,22,24,25-tetrahydroxyergost-4-en-3-one (petuniasterones H1 and H2). The compounds which have 1-α-acetoxy groups may easily be converted into the corresponding A-ring dienes by mild base. The orthoesters and other side-chain variants may be formed from the 24,25-epoxy compounds which co-occur in the plant.

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