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Androgens and anabolic steroids
Etynodiol
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Etynodiol

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Etynodiol
Etynodiol.svg
Clinical data
Other names Ethynodiol; 3β-Hydroxynorethisterone; 17α-Ethynylestr-4-ene-3β,17β-diol
Drug class Progestin; Progestogen
ATC code
Identifiers
  • (3S,8R,9S,10R,13S,14S,17R)-17-ethynyl-13-methyl-2,3,6,7,8,9,10,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthrene-3,17-diol
CAS Number
ChemSpider
UNII
CompTox Dashboard (EPA)
ECHA InfoCard 100.013.610
Chemical and physical data
Formula C20H28O2
Molar mass 300.442 g·mol−1
3D model (JSmol)
  • O[C@@H]4/C=C3\[C@@H]([C@H]2CC[C@]1([C@@H](CC[C@]1(C#C)O)[C@@H]2CC3)C)CC4
  • InChI=1S/C20H28O2/c1-3-20(22)11-9-18-17-6-4-13-12-14(21)5-7-15(13)16(17)8-10-19(18,20)2/h1,12,14-18,21-22H,4-11H2,2H3/t14-,15-,16+,17+,18-,19-,20-/m0/s1
  • Key:JYILPERKVHXLNF-QMNUTNMBSA-N

Etynodiol, or ethynodiol, is a steroidal progestin of the 19-nortestosterone group which was never marketed. A diacylated derivative, etynodiol diacetate, is used as a hormonal contraceptive.Etynodiol is sometimes used as a synonym for etynodiol diacetate.

It was patented in 1955.

Pharmacology

Etynodiol is a prodrug of norethisterone, and is converted immediately and completely into norethisterone. Etynodiol is an intermediate in the conversion of the prodrug lynestrenol into norethisterone.

Relative affinities (%) of norethisterone, metabolites, and prodrugs
Compound Typea PR AR ER GR MR SHBG CBG
Norethisterone – 67–75 15 0 0–1 0–3 16 0
5α-Dihydronorethisterone Metabolite 25 27 0 0 ? ? ?
3α,5α-Tetrahydronorethisterone Metabolite 1 0 0–1 0 ? ? ?
3α,5β-Tetrahydronorethisterone Metabolite ? 0 0 ? ? ? ?
3β,5α-Tetrahydronorethisterone Metabolite 1 0 0–8 0 ? ? ?
Ethinylestradiol Metabolite 15–25 1–3 112 1–3 0 0.18 0
Norethisterone acetate Prodrug 20 5 1 0 0 ? ?
Norethisterone enanthate Prodrug ? ? ? ? ? ? ?
Noretynodrel Prodrug 6 0 2 0 0 0 0
Etynodiol Prodrug 1 0 11–18 0 ? ? ?
Etynodiol diacetate Prodrug 1 0 0 0 0 ? ?
Lynestrenol Prodrug 1 1 3 0 0 ? ?
Notes: Values are percentages (%). Reference ligands (100%) were promegestone for the PR, metribolone for the AR, estradiol for the ER, dexamethasone for the GR, aldosterone for the MR, dihydrotestosterone for SHBG, and cortisol for CBG. Footnotes: a = Active or inactive metabolite, prodrug, or neither of norethisterone. Sources: See template.

Chemistry

See also: List of progestogens

Etynodiol is a 19-nortestosterone derivative. Structurally, it is almost identical to norethisterone and lynestrenol, differing only in its C3 substituent. Whereas norethisterone has a ketone at C3 and lynestrenol has no substituent at C3, etynodiol has a hydroxyl group at the position.

Synthesis

Ethynodiol diacetate synthesis: F. B. Colton, U.S. Patent 2,843,609 (1958 to Searle). Prepn of the 3-acetate, 17-acetate, and diacetate: P. D. Klimstra, U.S. Patent 3,176,013 (1965 to Searle); see also:

Society and culture

Generic names

Etynodiol is the generic name of the drug and its INN, while ethynodiol is its BAN.


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