Cypenamine, or phenylcyclopentamine, is a stimulant drug. It is currently known only in scientific research and has never been developed for market use. The trans- isomer is reported to be more active than the racemate. Cypenamine is currently legal throughout the entire world, and though its chemical structure has a vague similarity to certain controlled stimulants like fencamfamine (Glucoenergan, Reactivan), it is likely that it is too distant for it to be considered an illicit analogue under say the United States (U.S.) Federal Analogue Act (FAA) of the Controlled Substances Act (CSA).

2-Phenylcyclopentan-1-amine is a compound with two stereocenters. Thus, the following four following stereoisomers may exist:

The racemate (±)-trans-2-phenylcyclopentan-1-amine [1:1 mixture of (1R,2S)-trans-2-phenylcyclopentan-1-amine (box, left) and (1S,2R)-trans-2-phenylcyclopentan-1-amine (box, right)] is the active ingredient of cypenamine. Furthermore, the kinetic resolution of (±)-trans-2-phenylcyclopentan-1-amine by lipase B from Candida antarctica may effectivily performed by an aminolysis reaction.




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