The present invention relates to a new stereoselective process for the synthesis of 17(a)-17-acetyl-17-hydroxy-estr-4-en-3-one of formula (I), as well as to the new intermediates of the process. The 17(a)-17-acetyl-17-hy droxy-estr-4-en-3 -one (gestonorone) is an important intermediate in the synthesis of the active ingredients having progestogen activity - such as gestonorone capronate and nomegestroi acetate. Formulas (I), (II) and (III).
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