The synthesis of the tetracyclic skeleton of ecdysone with correct stereochemistry and substitution is described. 22,25‐Didehydroxy‐ecdysone and methyl (20 S )‐2β,3β‐dihydroxy‐6‐oxo‐5β‐pregn‐7‐ene‐20‐carboxylate have been prepared. The latter is a key intermediate in the synthesis of ecdysone.
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Furlenmeier et al. (1966) studied this question.
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