Abstract
Several routes to variously C-17-substituted Δ5-3-ketosteroids have been surveyed. The most convenient method was found to be oxidation of Δ5-3β-alcohol precursors with the Collins reagent, dipyridine chromium trioxide in méthylène chloride. The purities of the desired acid- and base-labile compounds obtained were ≥ 99% in each case.
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