New nonnatural α-amino acid derivatives with carboranyl fragments in α- and β-positions

A simple and effective method of the synthesis of derivatives of alpha-carboranyl-alpha-trifluoromethyl-alpha-amino acid and beta-carboranyl-alpha-trifluoromethyl-alpha-amino acid is presented. The structures of beta-carboranyl-alpha-trifluoromethyl-alpha-amino acid esters with differently protected amino groups were determined by single crystal Xray analysis.