Serotonin–Norepinephrine Reuptake Inhibitors (SNRI)

(S)-3-(Dimethylamino)-1-(2-thienyl)propan-1-ol is a polymerase chain reaction (PCR) reagent that is used as a building block for the synthesis of five membered ring lactams and dihedral polymers. This compound is synthesized by chemoenzymatic coupling of propanamine with trifluoroacetic acid in the presence of methyl groups, followed by catalytic hydrogenation to yield the desired product. The asymmetric synthesis of this compound was achieved through chiral resolution using NMR spectroscopy.

2-(N-Methyl-propanamine)-3-(2-naphthyl) thiophene is a synthetic compound that has been used as an impurity standard for the drug product and API. It has also been used for the pharmacopoeia, research and development, and analytical purposes. This compound is a metabolite of erythromycin.

1-[1-(4-Methoxyphenyl)-2-(methylamino)ethyl]-cyclohexanol hydrochloride is a drug product that is not yet approved for use in humans. It is an impurity found in the drug cyclosporine, which is used to treat psoriasis and other skin conditions. 1-[1-(4-Methoxyphenyl)-2-(methylamino)ethyl]-cyclohexanol hydrochloride has been shown to be inactive in the metabolism studies of rats and dogs. This impurity was detected by HPLC with UV detection at 254 nm, but it did not show any significant absorption at 280 nm. The purity of this compound was determined to be 97% by NMR analysis and HPLC.