(2R,3S)-3-Phenylisoserine Hydrochloride is used in the synthetic preparation of the catalytic asymmetric synthesis of both syn- and anti-β-amino alcohols. (2R,3S)-3-Phenylisoserine Hydrochloride is also used for the synthesis of N-benzoylphenylisoserinates of Lactarius sesquiterpenoid alcohols and is responsible for their antifeedant properties against storage pests.