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(Top) 1 Synthesis 2 See also 3 References

Mabuterol

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Mabuterol
Clinical data

Other names	Mabuterolum; PB 868Cl
Identifiers
IUPAC name 1-[4-amino-3-chloro-5-(trifluoromethyl)phenyl]-2-(tert-butylamino)ethanol
CAS Number	56341-08-3
PubChem CID	3995
ChemSpider	3857
UNII	R4K19W6S7Q
ChEBI	CHEBI:135325
ChEMBL	ChEMBL86749
CompTox Dashboard (EPA)	DTXSID3048283
Chemical and physical data
Formula	C₁₃H₁₈ClF₃N₂O
Molar mass	310.75 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES Clc1cc(cc(c1N)C(F)(F)F)C(O)CNC(C)(C)C
InChI InChI=1S/C13H18ClF3N2O/c1-12(2,3)19-6-10(20)7-4-8(13(15,16)17)11(18)9(14)5-7/h4-5,10,19-20H,6,18H2,1-3H3 Key:JSJCTEKTBOKRST-UHFFFAOYSA-N

Mabuterol is a selective β₂ adrenoreceptor agonist.^[1]^[2]

Synthesis[edit]

Mabuterol synthesis^[3]^[4]^[5]^[6]^[7]

The halogenation of 2-(Trifluoromethyl)aniline [88-17-5] (1) with iodine and sodium bicarbonate resulted in 2-Amino-5-Iodobenzotrifluoride [97760-97-9] (2). Protection with acetic anhydride followed by nucleophilic aromatic displacement with copper(I)cyanide gave N-[4-cyano-2-(trifluoromethyl)phenyl]acetamide [175277-96-0] (3). Hydrolysis of the nitrile and the protecting group gave 4-amino-3-(trifluoromethyl)benzoic acid [400-76-0] (4). Halogenation with chlorine gave 4-Amino-3-Chloro-5-(Trifluoromethyl)Benzoic Acid [95656-52-3] (5). Halogenation of the acid with thionyl chloride gave 4-Amino-3-chloro-5-(trifluoromethyl)benzoylchloride [63498-15-7] (6). Treatment with diethyl malonate [105-53-3] gave the acetophenone and hence 1-[4-amino-3-chloro-5-(trifluoromethyl)phenyl]ethanone [97760-76-4] (7). Halogenation with bromine in acetic acid led to 1-[4-amino-3-chloro-5-(trifluoromethyl)phenyl]-2-bromoethanone [97760-87-7] (8). Treatment with tert-butylamine [75-64-9] yielded 1-[4-amino-3-chloro-5-(trifluoromethyl)phenyl]-2-(tert-butylamino)ethenone, CID:13355601 (9). Reduction of the ketone with sodium borohydride completed the synthesis of Mabuterol (10).

References[edit]

^ Osada E, Murai T, Ishizaka Y, Sanai K (1984). "Pharmacological studies of mabuterol, a new selective beta 2-stimulant. II: Effects on the cardiovascular system and smooth muscle organs". Arzneimittel-Forschung. 34 (11A): 1641–1651. PMID 6152157.

^ Akahane K, Furukawa Y, Ogiwara Y, Haniuda M, Chiba S (July 1989). "Beta-adrenoceptor blocking effects of a selective beta 2-agonist, mabuterol, on the isolated, blood-perfused right atrium of the dog". British Journal of Pharmacology. 97 (3): 709–716. doi:10.1111/j.1476-5381.1989.tb12007.x. PMC 1854580. PMID 2474351.

^ Krüger G, Keck J, Noll K, Pieper H (1984). "Synthesis of further amino-halogen-substituted phenyl-aminoethanols". Arzneimittel-Forschung. 34 (11A): 1612–24. PMID 6152154.

^ BE 808743, Engelhardt G, Keck J, "Aminophenyl ethanolamines and oxazolidines - having analgesic, uterus spasmolytic and anti-spasmodic activity on cross-striped muscle structure", issued 1974, assigned to Thomae GmbH.

^ US 4119710, issued 1978, assigned to Boehringer Ing.

^ DE 2351281, assigned to Thomae GmbH.

^ Tu Y, Zhong J, Wang H, Pan J, Xu Z, Yang W, Luo Y (November 2016). "Synthesis of stable isotope labeled D9 -Mabuterol, D9 -Bambuterol, and D9 -Cimbuterol". Journal of Labelled Compounds & Radiopharmaceuticals. 59 (13): 546–551. doi:10.1002/jlcr.3446. PMID 27739098.