An Efficient Synthesis of (±)-4-Amino-3-(4-chlorophenyl)-butyric Acid. (Baclofen)

Abstract
A new preparation of baclofen is proposed. The key step involved a regioselective ring opening of 2-phenylaziridine with allylmagnesium bromide. Further oxydation of the side chain give access to 4-phenyl-pyrrolidin-2-one and to baclofen.