In this work we aimed at finding a concise method for the design of the new pharmacologically active compound 6, which is a precursor to obtaining non-protein amino acid 7 considered as GABA analogue, furthermore it can be used to construct enantiopure, conformationally restricted peptides. For this purpose the Schmidt reaction was applied.
Several novel cyclopropyl-rigidified gamma- and delta-amino acids 3-4 have been prepared starting from monoterpene (+)-3-carene 2. These compounds are proposed as chiral analogues of gamma-aminobutyric acid (GABA) 1 and are expected to be of interest as potential inhibitors of GABA receptors. (C) 2010 Elsevier Ltd. All rights reserved.