Begin with a chiral auxiliary, which is a molecule that can be temporarily attached to the starting material to induce chirality. Common chiral auxiliaries include camphor, tartaric acid derivatives, or amino acids. The choice of auxiliary depends on the specific diamine you want to synthesize.
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1-((2S,3S,5R,6R)-4-Acetyl-2,3-diisopropyl-5,6-diphenyl-piperazin-1-yl)-ethanone
(2S,3S)-3,4-diphenyl-2-methyl-2,3-epoxy-1-butanol
