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SC-5233
Clinical data
Other names	6,7-Dihydrocanrenone; 7-Desthioacetylspironolactone; 20-Spirox-4-ene-3,20-dione
Routes of; administration	By mouth
Drug class	Antimineralocorticoid; Progestogen; Steroidal antiandrogen
ATC code	None;
Identifiers
	IUPAC name (8R,9S,10R,13S,14S,17R)-10,13-dimethylspiro[2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene-17,5'-oxolane]-2',3-dione;
CAS Number	976-70-5;
PubChem CID	101931;
ChemSpider	92091;
UNII	3N8TCN29OP;
ChEMBL	ChEMBL400534;
CompTox Dashboard (EPA)	DTXSID10875403 ;
ECHA InfoCard	100.012.321
Chemical and physical data
Formula	C22H30O3
Molar mass	342.479 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES CC12CCC(=O)C=C1CCC3C2CCC4(C3CCC45CCC(=O)O5)C;
	InChI InChI=1S/C22H30O3/c1-20-9-5-15(23)13-14(20)3-4-16-17(20)6-10-21(2)18(16)7-11-22(21)12-8-19(24)25-22/h13,16-18H,3-12H2,1-2H3/t16-,17+,18+,20+,21+,22-/m1/s1; Key:UWBICEKKOYXZRG-WNHSNXHDSA-N;

SC-5233, also known as 6,7-dihydrocanrenone or 20-spirox-4-ene-3,20-dione, is a synthetic, steroidal antimineralocorticoid of the spirolactone group which was developed by G. D. Searle & Company in the 1950s but was never marketed.^[1]^[2] It was the first synthetic antagonist of the mineralocorticoid receptor to have been identified and tested in humans.^[1]^[3] The drug was found to lack appreciable oral bioavailability and to be of low potency when administered parenterally,^[4] but it nonetheless produced a mild diuretic effect in patients with congestive heart failure.^[1] SC-8109, the 19-nor (19-demethyl) analogue, was developed and found to have improved oral bioavailability and potency, but still had low potency.^[5] Spironolactone (SC-9420; Aldactone) followed and had both good oral bioavailability and potency, and was the first synthetic antimineralocorticoid to be marketed.^[3] It has about 46-fold higher oral potency than SC-5233.^[6]

SC-5233 is the propionic acid lactone of testosterone (androst-4-en-17β-ol-3-one) and is also known 3-(3-oxo-17β-hydroxyandrost-4-en-17α-yl)propionic acid γ-lactone or as 17α-(2-carboxyethyl)testosterone γ-lactone.^[7] It is the unsubstituted parent or prototype compound of the spirolactone family of steroidal antimineralocorticoids.^[2]^[8]

Similarly to other spirolactones like canrenone and spironolactone, SC-5233 has some antiandrogenic activity and antagonizes the effects of testosterone in animals.^[7] In addition, along with SC-8109, it has been found to possess potent progestogenic activity.^[9]

Chemical structures of spirolactones

Spirolactone

Chemical structures of progesterone and spirolactones (steroid-17α-spirolactones).

References

^ ^a ^b ^c Sherlock S (14 December 2013). "Diuretics in Liver Disease". In Buchborn E, Bock KD (eds.). Diuresis and Diuretics / Diurese und Diuretica: An International Symposium Herrenchiemsee, June 17th–20th, 1959 Sponsored by CIBA / Ein Internationales Symposium Herrenchiemsee, 17.–20. Juni 1959 Veranstaltet mit Unterstützung der CIBA. Springer-Verlag. pp. 224, 261. doi:10.1007/978-3-642-92756-0_11. ISBN 978-3-642-49716-2.
^ ^a ^b Szasz G, Budvari-Barany Z (19 December 1990). "Diuretics". Pharmaceutical Chemistry of Antihypertensive Agents. CRC Press. pp. 82–. ISBN 978-0-8493-4724-5.
^ ^a ^b Delcayre C, Fazal L, Ragot H, Prudhomme M, Azibani F, Samuel JL (6 November 2014). "The Renin-Angiotensin-Aldosterone System in Cardiovascular Disease". In Cokkinos DB (ed.). Introduction to Translational Cardiovascular Research. Springer. pp. 61–. ISBN 978-3-319-08798-6.
^ "Spironolactone". The British Encyclopaedia of Medical Practice: Medical progress. Butterworth & Company. 1961. p. 302. Cena and Kagawa first synthesized 3-(3-oxo-17β-hydroxy-4-androsten-17α-yl)-propionic acid-gamma-lactone and later prepared its 19-nor analogue. These compounds were designated SC-5233 and SC-8109, respectively. Both have anti-aldosterone activity and most of the early work on aldosterone antagonism was done with their aid. SC-5233 is not appreciably absorbed when given by mouth and the parenteral dose is large. As in the case of certain other steroids the 19-nor derivative was an improvement on the parent compound (Klyne, 1959). SC-8109 is well absorbed from the alimentary tract, but the dose is about 2 g daily.
^ Brandon ML (1 January 1962). Corticosteroids in medical practice. Thomas. p. 310. ISBN 9780398002152.
^ Kolkhof P, Bärfacker L (July 2017). "30 YEARS OF THE MINERALOCORTICOID RECEPTOR: Mineralocorticoid receptor antagonists: 60 years of research and development". The Journal of Endocrinology. 234 (1): T125 – T140. doi:10.1530/JOE-16-0600. PMC 5488394. PMID 28634268.
^ ^a ^b Kagawa CM, Sturtevant FM, Van Arman CG (June 1959). "Pharmacology of a new steroid that blocks salt activity of aldosterone and desoxycorticosterone". The Journal of Pharmacology and Experimental Therapeutics. 126 (2): 123–130. PMID 13665517. [SC-5233] (total dose of 5 mg/rat) partially blocked the effects of testosterone propionate on the seminal vesicles and prostate in similar animals.
^ Kalvoda J, de Gasparo M (24 August 2010). "Eplerenone: Selective Aldosterone Antagonist". In Fischer J, Ganellin CR (eds.). Analogue-based Drug Discovery II. John Wiley & Sons. pp. 361–. ISBN 978-3-527-63212-1.
^ Hertz R, Tullner WW (November 1958). "Progestational activity of certain steroid-17-spirolactones". Proceedings of the Society for Experimental Biology and Medicine. 99 (2): 451–452. doi:10.3181/00379727-99-24380. PMID 13601900. S2CID 20150966.