盐酸麻黄碱EP杂质A

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A reaction mixture was formed by admixing (i) 50 mg NAD, (ii) 4 ml of 2-propanol and (iii) 5 mmoles of 1-phenyl-1,2-propanedione, Compound 3, in a liquid medium containing 1 gm of lyophilized PED alcohol dehydrogenase preparation, 75 ml of 50 mM phosphate buffer, pH 7.1, and 25 ml of hexane. The pH value of the reaction was maintained constant by addition of 1N NaOH. The reaction mixture was maintained at room temperature until product formation stopped. When product formation stopped, (R)-1-hydroxy-1-phenyl-2-propanone, Compound 3a, was isolated by removal of the hexane layer and extraction of the aqueous layer with ethyl ether (3×75 ml). A reaction mixture was formed in a liquid medium containing