Enantioselective Synthesis of the Novel Chiral Sulfoxide Derivative as a Glycogen Synthase Kinase 3β Inhibitor

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Glycogen synthase kinase 3β (GSK-3β) inhibitors are expected to be attractive therapeutic agents for the treatment of Alzheimers disease (AD). Recently we discovered sulfoxides (S)-1 as a novel GSK-3β inhibitor having in vivo efficacy. We investigated practical asymmetric preparation methods for the scale-up synthesis of (S)-1. The highly enantioselective synthesis of (S)-1 (94% ee) was achieved by titanium-mediated oxidation with D-(−)-diethyl tartrate on gram scale.