Synthesis of putative precursors of ecdysone. Part 3. Synthesis of 3β, 14α, 25-trihydroxy-5β-cholest-7-en-6-one

Abstract
We describe here the first synthesis of 2, 22-dideoxyecdysone (3)(3β, 14α, 25-trihydroxy-5β-cholest-7en-6-one), a putative precursor in the biosynthesis of ecdysone (1). All the intermediates synthesized have a cis junction of the A/B rings (5β-H configuration).