BOMT

Short description: Chemical compound

BOMT

Clinical data
Other names| Ro 7-2340; 6α-Bromo-4-oxa-17α-methyl-5α-dihydrotestosterone; 6α-Bromo-4-oxa-17α-methyl-5α-androstan-17β-ol-3-one
Routes of
administration| By mouth
Drug class| Steroidal antiandrogen
ATC code|

* None

Identifiers

IUPAC name

* (1S,3aS,3bR,5S,5aS,9aR,9bS,11aS)-5-Bromo-1-hydroxy-1,9a,11a-trimethyl-2,3,3a,3b,4,5,5a,8,9,9b,10,11-dodecahydroindeno[5,4-f]chromen-7-one

CAS Number|

* 24543-59-7
24543-66-6

PubChem CID|

* 159972

ChemSpider|

* 140636

Chemical and physical data
Formula| C19H29BrO3
Molar mass| 385.342 g·mol−1
3D model (JSmol)|

* Interactive image

SMILES

* CC12CCC(=O)OC1C(CC3C2CCC4(C3CCC4(C)O)C)Br

InChI

* InChI=1S/C19H29BrO3/c1-17-7-6-15(21)23-16(17)14(20)10-11-12(17)4-8-18(2)13(11)5-9-19(18,3)22/h11-14,16,22H,4-10H2,1-3H3/t11-,12+,13+,14+,16-,17-,18+,19+/m1/s1

* Key:ZUIGZKIOHUNINA-LWPUPYOYSA-N

BOMT, also known by its developmental code name Ro 7-2340 and as 6α-bromo-4-oxa-17α-methyl-5α-dihydrotestosterone, is a synthetic steroidal antiandrogen which was first developed in 1970 and was never marketed for medical use.[1][2][3][4] It is the 6α-brominated, 4-oxygenated, and 17α-methylated derivative of the androgen dihydrotestosterone (DHT). Along with benorterone, cyproterone (and its C17α acetate ester, cyproterone acetate), and flutamide,[5] BOMT was among the earliest antiandrogens to be developed and extensively studied,[2][3][6][7] although it is less well-documented in comparison to the others.[8] BOMT has been investigated clinically in the treatment of benign prostatic hyperplasia, though development for this use did not continue.[9] There was also interest in BOMT for the potential applications of acne, pattern hair loss, and possibly prostate cancer, but it was not developed for these indications either.[10]

BOMT is a selective competitive antagonist of the androgen receptor (AR),[3][4][11][12][13] although it is described as an "only relatively weak competitor."[14] The relative binding affinity of the drug for the androgen receptor is about 2.7% of that of metribolone.[15] BOMT shows no androgenic, estrogenic, or progestogenic activity even at high doses, nor any inhibition of 5α-reductase,[16] though it has been reported to possess weak antigonadotropic effects.[3][4][11][12] Due to its selectivity for and competitive inhibition of the AR, BOMT has been described as a pure or "true" antiandrogen, similarly to benorterone, cyproterone, and flutamide.[17] Like other steroidal antiandrogens, BOMT may actually be a weak partial agonist of the AR, as it appears to have the potential for weak androgenic effects in specific situations.[18] On the basis of animal research, BOMT does not appear to act as an AR antagonist in central nervous system tissues, and in relation to this, does not disinhibit the hypothalamic–pituitary–gonadal axis or increase testosterone levels.[19]

## See also

* List of steroidal antiandrogens

## References

1. ↑ The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. 14 November 2014. pp. 178–. ISBN 978-1-4757-2085-3. https://books.google.com/books?id=0vXTBwAAQBAJ&pg=PA178.
2. ↑ 2.0 2.1 "A new antiandrogen, 6alpha-bromo-17 beta-hydroxy-17 alpha-methyl-4-oxa-5 alpha-androstan-3-one". Experientia 26 (1): 9–10. January 1970. doi:10.1007/BF01900355. PMID 5412314. "[It is shown that 6α-bromo-17β-hydroxy-17α-methyl-4-oxa-5α-androstan-3-one, has significant anti-androgenic activity. Isomers of this compound with different configuration at C-5 and C-6 were found to be inactive.]".
3. ↑ 3.0 3.1 3.2 3.3 "Some endocrine studies of a new antiandrogen, 6-alpha-bromo-17-beta-hydroxy-17-alpha-methyl-4-oxa-5-alpha-androstan-3-one (BOMT)". Endocrinology 88 (4): 1086–1091. April 1971. doi:10.1210/endo-88-4-1086. PMID 5542403.
4. ↑ 4.0 4.1 4.2 "An explanation of the antiandrogenic properties of 6 -bromo-17 -hydroxy-17 -methyl-4-oxa-5 -androstane-3-one". Steroids 20 (3): 331–343. September 1972. doi:10.1016/0039-128X(72)90092-X. PMID 5073580.
5. ↑ "Antiandrogens". Male Reproductive Function and Semen: Themes and Trends in Physiology, Biochemistry and Investigative Andrology. Springer Science & Business Media. 6 December 2012. pp. 352–. ISBN 978-1-4471-1300-3. https://books.google.com/books?id=cezjBwAAQBAJ&pg=PA352.
6. ↑ The Mechanism of Action of Androgens. Springer Science & Business Media. 6 December 2012. pp. 10–. ISBN 978-3-642-88429-0. https://books.google.com/books?id=rrDoCAAAQBAJ&pg=PA10.
7. ↑ "Steroidal antiandrogens and 5alpha-reductase inhibitors". Current Medicinal Chemistry 6 (12): 1107–23. December 1999. doi:10.2174/0929867306666220401180500. PMID 10519917. https://books.google.com/books?id=2zI4_gEr80IC&pg=PA1110. "Several androstane derivatives have also demonstrated an antiandrogenic activity; 17α-methyl-B-nortestosterone 8 was prepared and tested in 1964 for antihormonal activity [43]. Within the next decades, several other androstane analogs were prepared and found to possess antiandrogenic activity [43, 44, 45, 46] including BOMT 9 "figure 2", R2956 10, SC9420 11, and oxendolone 12 "figure 3".".
8. ↑ "Binding properties of testosterone receptors in the hypothalamic-preoptic area of the adult male mouse brain". Steroids 33 (4): 407–426. April 1979. doi:10.1016/0039-128X(79)90015-1. PMID 442132. "However, a less well documented antiandrogen, BOMT possesses the ideal characteristics of negligible androgenic, estrogenic and progestational activity (55) and would therefore appear to be a valuable compound for use in future investigations.".
9. ↑ Study of antiandrogen (Ro–7–2340) (6α-bromo-17β-methyl-4-oxa-5α-andronstan-3-one) in benign prostatic hypertrophy, 1973, https://books.google.com/books?id=9b5GAQAAMAAJ&q="Ro+7-2340"
10. ↑ "Androgens I. — A Review of Current Research on the Binding and Mechanism of Action of Androgenic Steroids, Notably 5α-Dihydrotestosterone". Receptors for Reproductive Hormones. Advances in Experimental Medicine and Biology. 36. 1973. pp. 197–231 (208). doi:10.1007/978-1-4684-3237-4_10. ISBN 978-1-4684-3239-8. https://books.google.com/books?id=_KnaBwAAQBAJ&pg=PA208.
11. ↑ 11.0 11.1 The mammalian testis. P. Elek. 1978. p. 144. ISBN 978-0-236-31057-9. https://books.google.com/books?id=d4l9AAAAIAAJ. "Another steroidal compound with anti-androgenic activity is BOMT (6α-bromo-17β-hydroxy-17α-methyl-4-oxa-5α-androstan-3-one). This compound has no androgenic, oestrogenic or progestational activity but is a potent anti-androgen (Boris et al., 1970); it competes effectively for the specific, high-affinity binding sites for DHT in the rat prostate (Mangan and Mainwaring, 1972) and depresses testis weight (Boris et al., 1970)."
12. ↑ 12.0 12.1 Steroid–Cell Interactions. Elsevier. 20 May 2014. pp. 52,61,70–71,300,401–403. ISBN 978-1-4831-6510-3. https://books.google.com/books?id=QxajBQAAQBAJ&pg=PA52.
13. ↑ "Androgen receptor antagonists (antiandrogens): structure-activity relationships". Current Medicinal Chemistry 7 (2): 211–247. February 2000. doi:10.2174/0929867003375371. PMID 10637363.
14. ↑ "Androgen binding in rat uterus cytosol. Study of the specificity". Journal of Steroid Biochemistry 7 (5): 335–343. May 1976. doi:10.1016/0022-4731(76)90092-3. PMID 180344. "Finally, the steroidal antiandrogen BOMT and the non-steroidal antiandrogen DIMP are only relatively weak competitors.".
15. ↑ "Receptor binding and biological activity of steroidal and nonsteroidal antiandrogens". Journal of Steroid Biochemistry 15: 355–359. December 1981. doi:10.1016/0022-4731(81)90297-1. PMID 7339263.
16. ↑ "The biochemical basis for the antagonism by BOMT of the effects of dihydrotesterone on the rat ventral prostate gland". Gynecologic Investigation 2 (1): 300–304. 1971. doi:10.1159/000301871. PMID 5161490.
17. ↑ "Treatment of hirsutism with spironolactone". Clinics in Endocrinology and Metabolism 15 (2): 363–371. May 1986. doi:10.1016/S0300-595X(86)80030-5. PMID 2941190. "Flutamide, cyproterone, benorterone, RU-2956, BOMT and cimetidine are recognized as true antiandrogens because they act as competitive inhibitors of specific ligand binding to androgen receptors.".
18. ↑ "The male genital tract and the nipples of male and female offspring of rats given the non-steroidal antiandrogens DIMP and Sch 13521, during pregnancy". Archives d'Anatomie Microscopique et de Morphologie Experimentale 64 (1): 27–44. 1975. PMID 1217898.
19. ↑ "BOMT (6 alpha-bromo-17 beta-hydroxy-17 alpha-methyl-4-oxa-5 alpha-androstan-3-one) is not an androgen antagonist within the central nervous system". Steroids 34 (2): 139–149. August 1979. doi:10.1016/0039-128X(79)90043-6. PMID 494357.

* v
* t
* e

Androgen receptor modulators

AR|

| Agonists|

* Testosterone derivatives: 4-Androstenediol
* 4-Dehydroepiandrosterone (4-DHEA)
* 4-Hydroxytestosterone
* 4,17α-Dimethyltestosterone
* 5-Androstenedione
* 11-Ketotestosterone
* 11β-Hydroxyandrostenedione
* Adrenosterone (11-ketoandrostenedione, 11-oxoandrostenedione)
* Androstenediol (5-androstenediol)
* Androstenediol 3β-acetate
* Androstenediol 17β-acetate
* Androstenediol diacetate
* Androstenediol dipropionate
* Androstenedione (4-androstenedione)
* Atamestane
* Boldenone
* Boldenone undecylenate
* Boldione (1,4-androstadienedione)
* Clostebol
* Clostebol acetate
* Clostebol caproate
* Clostebol propionate
* Cloxotestosterone
* Cloxotestosterone acetate
* Dehydroandrosterone
* DHEA (androstenolone, prasterone; 5-DHEA)
* DHEA enanthate (prasterone enanthate)
* DHEA sulfate
* Exemestane
* Formestane
* Plomestane
* Quinbolone
* Silandrone
* Testosterone# (+dutasteride)
* Testosterone esters
* Polytestosterone phloretin phosphate

* Dihydrotestosterone derivatives: 1-Androstenediol
* 1-Androstenedione
* 1-Androsterone (1-andro, 1-DHEA)
* 1-Testosterone
* 3α-Androstanediol
* 5α-Androst-2-en-17-one
* 7β-Hydroxyepiandrosterone
* 11-Ketodihydrotestosterone
* Androsterone
* Bolazine
* Bolazine capronate
* Dihydroethisterone
* Dihydroethyltestosterone
* Dihydrofluoxymesterone
* Dihydromethylandrostenediol
* Dihydrotestosterone (DHT) (androstanolone, stanolone)
* Dihydrotestosterone esters
* Drostanolone
* Drostanolone propionate
* Epiandrosterone
* Epitiostanol
* Mepitiostane
* Mesabolone
* Mesterolone
* Mesterolone cipionate
* Methyldiazinol
* Nisterime
* Nisterime acetate
* Prostanozol
* Stenbolone
* Stenbolone acetate
* Testifenon (testiphenon, testiphenone)

* 19-Nortestosterone derivatives: 7α-Methyl-19-norandrostenedione (MENT dione, trestione)
* 11β-Methyl-19-nortestosterone
* 11β-Methyl-19-nortestosterone dodecylcarbonate
* 19-Nor-5-androstenediol
* 19-Nor-5-androstenedione
* 19-Nordehydroepiandrosterone
* Bolandiol
* Bolandiol dipropionate
* Bolandione (19-nor-4-androstenedione)
* Bolmantalate (nandrolone adamantoate)
* Dienedione
* Dienolone
* Dimethandrolone
* Dimethandrolone buciclate
* Dimethandrolone dodecylcarbonate
* Dimethandrolone undecanoate
* LS-1727 (nandrolone 17β-N-(2-chloroethyl)-N-nitrosocarbamate)
* Methoxydienone (methoxygonadiene)
* Nandrolone
* Nandrolone esters
* Norclostebol
* Norclostebol acetate
* Normethandrone (methylestrenolone, normethisterone)
* Oxabolone
* Oxabolone cipionate (oxabolone cypionate)
* Trenbolone
* Trenbolone acetate
* Trenbolone enanthate
* Trenbolone hexahydrobenzylcarbonate
* Trenbolone undecanoate
* Trendione
* Trestolone (MENT)
* Trestolone acetate
* Trestolone enanthate

* Dihydrotestosterone and 19-nortestosterone derivatives: 5α-Dihydrolevonorgestrel
* 5α-Dihydronandrolone
* 5α-Dihydronorethandrolone
* 5α-Dihydronorethisterone
* 5α-Dihydronormethandrone
* 5α-Dihydrotrestolone
* 19-Norandrosterone

* 17α-Alkylated testosterone derivatives: Bolasterone
* Calusterone
* Chlorodehydromethylandrostenediol (CDMA)
* Chlorodehydromethyltestosterone (CDMT)
* Chloromethylandrostenediol (CMA)
* Enestebol
* Ethyltestosterone
* Fluoxymesterone
* Formebolone
* Hydroxystenozole
* Metandienone (methandrostenolone)
* Methandriol (methylandrostenediol)
* Methandriol bisenanthoyl acetate
* Methandriol diacetate
* Methandriol dipropionate
* Methandriol propionate
* Methylclostebol (chloromethyltestosterone)
* Methyltestosterone (+esterified estrogens)
* Methyltestosterone 3-hexyl ether
* Oxymesterone
* Penmesterol
* Tiomesterone

* 17α-Alkylated dihydrotestosterone derivatives: Androisoxazole
* Desoxymethyltestosterone
* Furazabol
* Mebolazine (dimethazine)
* Mestanolone
* Metenolone
* Metenolone acetate
* Metenolone enanthate
* Methasterone
* Methyl-1-testosterone
* Methylepitiostanol
* Methylstenbolone
* Oxandrolone
* Oxymetholone
* Stanozolol

* 17α-Alkylated 19-nortestosterone derivatives: Bolenol
* Dimethyldienolone
* Dimethyltrienolone
* Ethyldienolone
* Ethylestrenol
* Methyldienolone
* Methylhydroxynandrolone (MOHN, MHN)
* Metribolone
* Mibolerone
* Norboletone
* Norethandrolone
* Propetandrol
* RU-2309
* Tetrahydrogestrinone

* 17α-Vinyltestosterone derivatives: Norvinisterone (vinylnortestosterone)
* Vinyltestosterone

* 17α-Ethynyltestosterone derivatives: Δ4-Tibolone
* Danazol
* Desogestrel
* Ethisterone (ethynyltestosterone)
* Etonogestrel
* Etynodiol
* Etynodiol diacetate
* Gestodene
* Gestrinone
* Levonorgestrel
* Levonorgestrel esters (e.g., levonorgestrel butanoate)
* Lynestrenol
* Lynestrenol phenylpropionate
* Norethisterone
* Norethisterone esters (e.g., norethisterone acetate, norethisterone enanthate)
* Norgestrel
* Norgestrienone
* Quingestanol
* Quingestanol acetate
* Tibolone

* Progesterone derivatives: Medroxyprogesterone acetate
* Megestrol acetate

* Others/unsorted: 3-Keto-5α-abiraterone
* 5α-Androstane
* Alternariol
* Cl-4AS-1
* Drupanol
* ZM-182345

|

Mixed
(SARMs)|

* Nonsteroidal: 198RL26
* ACP-105
* AC-262536
* Acetothiolutamide
* Andarine (acetamidoxolutamide, androxolutamide, GTx-007, S-4)
* BMS-564929
* DTIB
* Enobosarm (ostarine, MK-2866, GTx-024, S-22)
* FTBU-1
* GSK-4336A
* GSK-8698
* LG-121071 (LGD-121071)
* LGD-2226
* LGD-2941 (LGD-122941)
* LGD-3303
* LGD-4033
* JNJ-26146900
* JNJ-28330835
* JNJ-37654032
* ORM-11984
* R-1
* RAD140
* RU-59063
* S-1
* S-23
* S-40503
* S-101479
* Triclosan

* Steroidal: EM-9017
* MK-0773
* TFM-4AS-1
* YK-11

Antagonists|

* Steroidal: 7α-Thioprogesterone
* 7α-Thiospironolactone
* 7α-Thiomethylspironolactone
* 11α-Hydroxyprogesterone
* 15β-Hydroxycyproterone acetate
* Abiraterone
* Abiraterone acetate
* Allyltestosterone
* Benorterone
* BOMT
* Canrenoic acid
* Canrenone
* Chlormadinone acetate
* Clascoterone
* Clometerone
* Cyproheptadine
* Cyproterone
* Cyproterone acetate
* Delanterone
* Delmadinone acetate
* Dicirenone
* Dienogest
* Drospirenone
* DU-41165
* Edogestrone
* EM-4350
* EM-5854
* EM-5855
* EM-6537
* Epitestosterone
* Galeterone
* Guggulsterone
* Medrogestone
* Megestrol acetate
* Mespirenone
* Metogest
* Mexrenone
* Mifepristone
* Nomegestrol acetate
* Nordinone
* Osaterone
* Osaterone acetate
* Oxendolone
* Potassium canrenoate
* Promegestone
* Prorenone
* Rosterolone
* RU-15328
* SC-5233 (spirolactone)
* Spironolactone
* Spirorenone
* Spiroxasone
* Topterone
* Trimegestone
* Trimethyltrienolone (R-2956)
* Zanoterone

* Nonsteroidal: 5N-Bicalutamide
* AA560
* Antarlides
* Arabilin
* Apalutamide
* Atraric acid
* AZD-3514
* Bakuchiol
* BAY-1024767
* Bicalutamide
* Bisphenols (e.g., BADGE, BFDGE, bisphenol A, bisphenol F, bisphenol S)
* BMS-501949
* BMS-570511
* BMS-641988
* CH5137291
* Cimetidine
* Cioteronel
* Cyanonilutamide
* Darolutamide
* DDT (via metabolite p,p’-DDE)
* Dieldrin
* DIMP
* Endosulfan
* Enzalutamide
* EPI-001
* Fenarimol
* Flutamide
* Hydroxyflutamide
* Inocoterone
* Inocoterone acetate
* Ketoconazole
* Ketodarolutamide
* Lavender oil
* LG-105
* LG-120907
* LGD-1331
* Linuron
* Methiocarb
* N-Butylbenzenesulfonamide
* N-Desmethylapalutamide
* N-Desmethylenzalutamide
* Nilutamide
* ONC1-13B
* Pentomone
* PF-998425
* Phenothrin
* Prochloraz
* Procymidone
* Proxalutamide
* Ralaniten (EPI-002)
* Ralaniten acetate (EPI-506)
* RD-162
* Ro 2-7239
* Ro 5-2537
* RU-22930
* RU-56187
* RU-57073
* RU-58642
* RU-58841
* Seviteronel
* Thalidomide
* Topilutamide (fluridil)
* Valproic acid
* Vinclozolin
* YM-580
* YM-92088
* YM-175735

GPRC6A|

| Agonists|

* Cations (incl. aluminum, calcium, Gadolinium

|

See also
Receptor/signaling modulators
Androgens and antiandrogens
Estrogen receptor modulators
Progesterone receptor modulators
List of androgens/anabolic steroids

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*[GPRC6A]: G protein-coupled receptor family C group 6 member A