Protect the amino group of the chiral auxiliary. Common protecting groups for amines include Boc (tert-butyloxycarbonyl) or Fmoc (9-fluorenylmethoxycarbonyl). The choice of protecting group will depend on the specific reaction conditions.
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(2S)-2-fluoro-2-(9H-fluoren-9-ylmethoxycarbonylaminomethyl)-3-phenylpropanoic acid
N-(2,6-dimethylphenyl)-L-alanine
C18H22N2O3S
Ethyl acetate
METHANOL
Ethanone, 1-[1,4,5,6-tetrahydro-1-(1-methylethyl)-2-pyridinyl]- (9CI)
