17α-Allyl-19-nortestosterone

17α-Allyl-19-nortestosterone

Clinical data
Other names	Allylnortestosterone; Allylestrenolone; Allylnandrolone; 3-Ketoallylestrenol; 17α-Allylestr-4-en-17β-ol-3-one; Allylestrenolone
Drug class	Progestogen
Identifiers
IUPAC name (8R,9S,10R,13S,14S,17R)-17-hydroxy-13-methyl-17-prop-2-enyl-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one
CAS Number	7358-46-5^Y
PubChem CID	22790929
ChemSpider	22270
UNII	EH9MJ5WS79
Chemical and physical data
Formula	C21H30O2
Molar mass	314.469 g·mol^−1
3D model (JSmol)	Interactive image
SMILES C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(CC=C)O)CCC4=CC(=O)CC[C@H]34
InChI InChI=1S/C21H30O2/c1-3-10-21(23)12-9-19-18-6-4-14-13-15(22)5-7-16(14)17(18)8-11-20(19,21)2/h3,13,16-19,23H,1,4-12H2,2H3/t16-,17+,18+,19-,20-,21-/m0/s1 Key:NXGWVXNWOIYZLE-XUDSTZEESA-N

17α-Allyl-19-nortestosterone, also known as 3-ketoallylestrenol or as 17α-allylestr-4-en-17β-ol-3-one, is a progestin which was never marketed.[1][2][3][4] It is a combined derivative of the anabolic–androgenic steroid and progestogen nandrolone (19-nortestosterone) and the antiandrogen allyltestosterone (17α-allyltestosterone).[1][2][3] The drug is a major active metabolite of allylestrenol, which is thought to be a prodrug of 17α-allyl-19-nortestosterone.[4][5]

17α-Allyl-19-nortestosterone has 24% of the affinity of ORG-2058 and 186% of the affinity of progesterone for the progesterone receptor, 4.5% of the affinity of testosterone for the androgen receptor, 9.8% of the affinity of dexamethasone for the glucocorticoid receptor, 2.8% of the affinity of testosterone for sex hormone-binding globulin, and less than 0.2% of the affinity of estradiol for the estrogen receptor.[6][7] The affinity of 17α-allyl-19-nortestosterone for the androgen receptor was less than that of norethisterone and medroxyprogesterone acetate and its affinity for sex hormone-binding globulin was much lower than that of norethisterone.[6] These findings may help to explain the absence of teratogenic effects of allylestrenol on the external genitalia of female and male rat fetuses.[6]

Relative affinities (%) of allylestrenol and metabolites[6]

Compound	PRTooltip Progesterone receptor	ARTooltip Androgen receptor	ERTooltip Estrogen receptor	GRTooltip Glucocorticoid receptor	MRTooltip Mineralocorticoid receptor	SHBGTooltip Sex hormone-binding globulin	CBGTooltip Corticosteroid binding globulin
Allylestrenol	0	0	0	0	?	1	?
17α-Allyl-19-NT	186	5	0	10	?	3	?
Values are percentages (%). Reference ligands (100%) were P4Tooltip progesterone (medication) for the PRTooltip progesterone receptor, TTooltip testosterone (medication) for the ARTooltip androgen receptor, E2 for the ERTooltip estrogen receptor, DEXATooltip dexamethasone for the GRTooltip glucocorticoid receptor, aldosterone for the MRTooltip mineralocorticoid receptor, TTooltip testosterone (medication) for SHBGTooltip sex hormone-binding globulin, and cortisol for CBGTooltip Corticosteroid-binding globulin.

See also

• Altrenogest
• Ethinyltestosterone
• Vinyltestosterone

References

1. Colton FB, Nysted LN, Riegel B, Raymond AL (1957). "17-Alkyl-19-nortestosterones". Journal of the American Chemical Society. 79 (5): 1123–1127. doi:10.1021/ja01562a028. ISSN 0002-7863.
2. Miyake T, Pincus G (December 1958). "Progestational activity of certain 19-norsteroids and progesterone derivatives". Endocrinology. 63 (6): 816–824. doi:10.1210/endo-63-6-816. PMID 13609555.
3. Miyake T (3 February 2016). "Progestational Substances". In Dorfman RI (ed.). Methods in Hormone Research. Vol. 2 Bioassay. Elsevier. pp. 134–. ISBN 978-1-4832-7276-4.
4. McRobb L, Handelsman DJ, Kazlauskas R, Wilkinson S, McLeod MD, Heather AK (May 2008). "Structure-activity relationships of synthetic progestins in a yeast-based in vitro androgen bioassay". The Journal of Steroid Biochemistry and Molecular Biology. 110 (1–2): 39–47. doi:10.1016/j.jsbmb.2007.10.008. PMID 18395441. S2CID 5612000.
5. Zeelen FJ (1990). Medicinal chemistry of steroids. Elsevier Science Limited. pp. 108–109. ISBN 978-0-444-88727-6. Other examples are allylestrenol (42), a pro-drug converted to the 3-keto analogue (43), which is used in the treatment of threatened abortion [78,79] and altrenogest (44), used in sows and mares to suppress ovulation and estrus behaviour [80]. [...] Progestins with a 17a-allyl side chain: (42) allylestrenol, (43), (44) altrenogest.
6. Bergink EW, Loonen PB, Kloosterboer HJ (August 1985). "Receptor binding of allylestrenol, a progestagen of the 19-nortestosterone series without androgenic properties". Journal of Steroid Biochemistry. 23 (2): 165–168. doi:10.1016/0022-4731(85)90232-8. PMID 3928974.
7. Madjerek Z, De Visser J, Van Der Vies J, Overbeek GA (September 1960). "Allylestrenol, a pregnancy maintaining oral gestagen". Acta Endocrinologica. 35 (I): 8–19. doi:10.1530/acta.0.XXXV0008. PMID 13765069.