Enantioselective synthesis of β-fluoroamines from β-amino alcohols: application to the synthesis of LY503430.

N,N-Dialkyl-β-amino alcohols were enantiospecifically and regioselectively rearranged by using N,N-diethylaminosulfur trifluoride (DAST) to give optically active β-fluoroamines in excellent yields and enantiomeric excesses. This rearrangement was applied to the enantioselective synthesis of LY503430, a potential therapeutic agent for Parkinson's disease.