In some cases, in situ generation of the chiral base from a non-chiral precursor can be employed to control enantioselectivity. This approach may involve using a racemic base and a chiral auxiliary that transfers chirality during the reaction.
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N-((S)-1-phenylethyl)-(2S,3S)-2,3-dimethylpent-4-enamide
tert-butyl [(1S)-1-benzyl-2-oxo-2-pyrrolidin-1-ylethyl]carbamate
2,5-Pyrrolidinedione, 1-[(4-nitrophenyl)thio]-
