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Alfaxalone

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Alfaxalone Basic information

Product Name:
Alfaxalone
Synonyms:
  • 3ALPHA-HYDROXY-5ALPHA-PREGNANE-11,20-DIONE
  • 3-HYDROXY-5ALPHA-PREGNANE-11,20-DIONE
  • 5ALPHA-PREGNAN-3ALPHA-OL-11,20-DIONE
  • ALFAXALONE
  • ALPHAXALONE
  • (3-alpha,5-alpha)-3-hydroxypregnane-11,20-dione
  • 20-dione,3-alpha-hydroxy-5-alpha-pregnane-1
  • 20-dione,3-hydroxy-,(3-alpha,5-alpha)-pregnane-1
CAS:
23930-19-0
MF:
C21H32O3
MW:
332.48
Mol File:
23930-19-0.mol
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Alfaxalone Chemical Properties

Melting point:
172-174°
alpha 
D26 +113.4° (c = 1.2 in chloroform).
Boiling point:
409.59°C (rough estimate)
Density 
1.0834 (rough estimate)
refractive index 
1.5192 (estimate)
storage temp. 
Store at RT
solubility 
chloroform: ≥5 mg/mL, clear, colorless
form 
powder
pka
15.05±0.70(Predicted)
color 
white
InChI
InChI=1/C21H32O3/c1-12(22)16-6-7-17-15-5-4-13-10-14(23)8-9-20(13,2)19(15)18(24)11-21(16,17)3/h13-17,19,23H,4-11H2,1-3H3/t13-,14+,15-,16+,17-,19+,20-,21+/s3
InChIKey
DUHUCHOQIDJXAT-YYJIQYHHNA-N
SMILES
[C@]12([H])C(=O)C[C@]3(C)[C@H](CC[C@@]3([H])[C@]1([H])CC[C@@]1([H])C[C@H](O)CC[C@]21C)C(=O)C |&1:0,5,7,10,12,16,19,23,r|
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Safety Information

Hazard Codes 
Xn
Risk Statements 
22
Safety Statements 
22-36
RIDADR 
UN 2811 6.1/PG 3
WGK Germany 
3
RTECS 
TU4157800
Toxicity
LD50 i.v. in mice: 43 mg/kg (Al-Khawashki)

MSDS

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Alfaxalone Usage And Synthesis

Description

Alfaxalone (Alfaxan, Vetoquinol) is a neurologically active steroid compound that induces general anaesthesia. Alfaxalone exerts its action by binding to GABA receptors on the neuronal cell surface, affecting cell membrane chloride ion transport. It has negligible analgesic properties at therapeutic doses. Alfaxalone may be administered either intravenously or intramuscularly, and due to the possibility of apnoea after intravenous induction this route should be reserved for cases where intubation can be achieved[2].

Originator

Althesin ,Glaxo ,UK ,1972

Uses

Anesthetic;nociception blocker

Definition

ChEBI: Alphaxolone is a corticosteroid hormone.

Manufacturing Process

A solution of 3α-hydroxy-5α-pregn-16-ene-11,20-dione (200 mg) in freshly distilled tetrahydrofuran (8 ml) with 5% palladium on carbon (100 ml) was hydrogenated until hydrogen uptake ceased. The mixture was filtered through a pad of kieselguhr and the tetrahydrofuran removed in vacuum to give 196 mg, MP 171°C to 172°C.

Therapeutic Function

Anesthetic component

Biological Activity

A neurosteroid anesthetic that directly activates and potentiates GABA A receptor-activated membrane current (I GABA ). Efficacy but not potency is determined by the alpha subunit of the receptor (EC 50 values are 1.4, 1.8, 2.1, 2.4 and 2.5 μ M for α 1 β 1 γ 3, α 1 β 1 γ 1, β 1 γ 1, α 2 β 1 γ 2L and α 1 β 1 γ 2L isoforms respectively).

Mechanism of action

Alfaxalone's mechanism of action is chloride ion modulation associated with interaction with the neuronal membrane GABA A receptor[1].

Side effects

Alfaxalone is safe and effective at 12–15 mg/kg IM for routine noninvasive procedures and lasts approximately 40–45 min. The most common side effects are dose-dependent but transient hypotension (15 min), hypoventilation, and apnea. Higher doses of alfaxalone (12 mg/kg) may cause mild hypoxemia, which can be corrected by administration of supplemental oxygen via face mask. Muscle twitching occurs toward the end of immobilization and can be used as a sign of impending emergence[1].

Synthesis

It is prepared by reduction of 3,11,20-trioxo-5-α-pregnane with trimethyl phosphite in the presence of an iridium catalyst. Only this reducing agent forms the axial alcohol (3α) .

References

[1] Marini, R. and J. Haupt. “Anesthesia and Select Surgical Procedures.” The Common Marmoset in Captivity and Biomedical Research 61 1 (2019).
[2] Molly Varga BVetMed DZooMed MRCVS. “Anaesthesia and Analgesia.” Textbook of Rabbit Medicine (Second Edition) (2014): 178-202.

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