Abstract
Cis-4-Aminocyclopent-2-ene-1-carboxylic acid (4), 4-aminocyclopent-1- ene-1-carboxylic acid (5) and 3-aminocyclopent-1-ene-1-carboxylic acid (6) have been synthesized as conformationally restricted analogues of the inhibitory neurotransmitter GABA.