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Asymmetric Synthesis of Substituted <i>anti</i>-β-Fluorophenylalanines
A range of substituted <i>anti</i>-β-fluorophenylalanines
was produced from the corresponding enantiopure α‑hydroxy-β-amino
esters using a stereospecific XtalFluor-E promoted rearrangement procedure
as the key step. The requisite substrates are readily produced via
aminohydroxylation of an α,β-unsaturated ester using our
lithium amide conjugate addition methodology and, following rearrangement,
deprotection of the resultant enantiopure β-fluoro-α-amino
esters gives the corresponding enantiopure <i>anti</i>-β-fluorophenylalanines
in good yield and high diastereoisomeric purity