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Procaterol
Procaterol, applied as procaterol hydrochloride (USAN), is an intermediate-acting β2-adrenergic receptor agonist used for the treatment of asthma. It has never been filed for FDA evaluation in the United States, where it is not marketed. The drug is readily oxidised in the presence of moisture and air, making it unsuitable for therapeutic use by inhalation. Pharmaceutical company Parke-Davis/Warner-Lambert researched a stabilizer to prevent oxidation, but an effective one was never developed.〔 ==Synthesis== Like pirbuterol, procaterol exhibits similar broncholytic properties as albuteral, but it has somewhat of a more prolonged action. It is recommended for use as an inhaled drug for treating bronchial asthma. 8-Hydroxycarbostyril is acylated with 2-bromobutyric acid chloride at the fifth position of the quinoline system, which gives the compound 3. This undergoes action of isopropylamine, forming an aminoketone, the carbonyl group of which is reduced by sodium borohydride, giving procaterol. Synonyms of this drug are onsukil, masacin, procadil, meptin, and others.
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