Enantioselective synthesis of (S)-trans-γ-butenynyl γ-aminobutyric acid (GABA)

Abstract
The enantioselective synthesis of (S)-trans-g;-butenynyl γ-aminobutyric acid (GABA)1 by phthalimide displacement of the (R)-alcohol 9(generated from the acetal 3) is reported. Novel hydride reductions of the pentadiynylic ether 3 to the trans-enyne 5 are reported and discussed.