Estradiol phosphate

Estradiol phosphate, or estradiol 17β-phosphate, also known as estra-1,3,5(10)-triene-3,17β-diol 17β-(dihydrogen phosphate), is an estrogen which was never marketed. It is an estrogen ester, specifically an ester of estradiol with phosphoric acid, and acts as a prodrug of estradiol in the body.[1][2] It is rapidly cleaved by phosphatase enzymes into estradiol upon administration.[1][2] Estradiol phosphate is contained within the chemical structures of two other estradiol esters, polyestradiol phosphate (a polymer of estradiol phosphate) and estramustine phosphate (estradiol 3-normustine 17β-phosphate), both of which have been marketed for the treatment of prostate cancer.[2][3][1]

Structural properties of selected estradiol esters
EstrogenStructureEster(s)Relative
mol. weight
Relative
E2 contentb
logPc
Position(s)Moiet(ies)TypeLengtha
Estradiol
1.001.004.0
Estradiol acetate
C3Ethanoic acidStraight-chain fatty acid21.150.874.2
Estradiol benzoate
C3Benzenecarboxylic acidAromatic fatty acid– (~4–5)1.380.724.7
Estradiol dipropionate
C3, C17βPropanoic acid (×2)Straight-chain fatty acid3 (×2)1.410.714.9
Estradiol valerate
C17βPentanoic acidStraight-chain fatty acid51.310.765.6–6.3
Estradiol benzoate butyrate
C3, C17βBenzoic acid, butyric acidMixed fatty acid– (~6, 2)1.640.616.3
Estradiol cypionate
C17βCyclopentylpropanoic acidAromatic fatty acid– (~6)1.460.696.9
Estradiol enanthate
C17βHeptanoic acidStraight-chain fatty acid71.410.716.7–7.3
Estradiol dienanthate
C3, C17βHeptanoic acid (×2)Straight-chain fatty acid7 (×2)1.820.558.1–10.4
Estradiol undecylate
C17βUndecanoic acidStraight-chain fatty acid111.620.629.2–9.8
Estradiol stearate
C17βOctadecanoic acidStraight-chain fatty acid181.980.5112.2–12.4
Estradiol distearate
C3, C17βOctadecanoic acid (×2)Straight-chain fatty acid18 (×2)2.960.3420.2
Estradiol sulfate
C3Sulfuric acidWater-soluble conjugate1.290.770.3–3.8
Estradiol glucuronide
C17βGlucuronic acidWater-soluble conjugate1.650.612.1–2.7
Estramustine phosphated
C3, C17βNormustine, phosphoric acidWater-soluble conjugate1.910.522.9–5.0
Polyestradiol phosphatee
C3–C17βPhosphoric acidWater-soluble conjugate1.23f0.81f2.9g
Footnotes: a = Length of ester in carbon atoms for straight-chain fatty acids or approximate length of ester in carbon atoms for aromatic fatty acids. b = Relative estradiol content by weight (i.e., relative estrogenic exposure). c = Experimental or predicted octanol/water partition coefficient (i.e., lipophilicity/hydrophobicity). Retrieved from PubChem, ChemSpider, and DrugBank. d = Also known as estradiol normustine phosphate. e = Polymer of estradiol phosphate (~13 repeat units). f = Relative molecular weight or estradiol content per repeat unit. g = logP of repeat unit (i.e., estradiol phosphate). Sources: See individual articles.
Estradiol phosphate
Clinical data
Other namesEstradiol 17β-phosphate; Estra-1,3,5(10)-triene-3,17β-diol 17β-(dihydrogen phosphate); 3-Hydroxyestra-1,3,5(10)-trien-17β-yl phosphate
Drug classEstrogen; Estrogen ester
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII
ChEMBL
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC18H25O5P
Molar mass352.367 g·mol−1
3D model (JSmol)

See also

References

  1. Franco Cavalli; Stan B. Kaye`; Heine H Hansen; James O Armitage, Martine Piccart-Gebhart (12 September 2009). Textbook of Medical Oncology, Fourth Edition. CRC Press. pp. 442–. ISBN 978-0-203-09289-7.
  2. Gunnarsson PO, Norlén BJ (1988). "Clinical pharmacology of polyestradiol phosphate". Prostate. 13 (4): 299–304. doi:10.1002/pros.2990130405. PMID 3217277. S2CID 33063805.
  3. P. H. Smith (29 June 2013). Cancer of the Prostate and Kidney. Springer Science & Business Media. pp. 359–. ISBN 978-1-4684-4349-3.



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