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Dehydronandrolone acetate is a critical precursor in the synthesis of C7-functionalized steroidal drugs such as the new anti-breast cancer drug Fulvestrant, the treatment of menopause and postmenopausal syndrome drug Tibolone, as well as the highly effective protein anabolic hormone Mibolone. Nandrolone as starting material was first subjected to simultaneous acylation with acetic anhydride and acetyl chloride to form the intermediate, which was then brominated with N-bromosuccinimide (NBS) under basic conditions to eliminate one molecule of HBr to produce Dehydronandrolone acetate (73% yield)[1].

Pale Yellow Solid

Tibolone intermediate.

[1] Zili Zhang and Aitao Li*. “A Designed Chemoenzymatic Route for Efficient Synthesis of 6-Dehydronandrolone Acetate: A Key Precursor in the Synthesis of C7-Functionalized Steroidal Drugs.” ACS Catalysis 13 19 (2023): 13111–13116.