A series of stable C1-symmetric chiral diamines (2a–2l) were conveniently synthesized by condensing exo-(−)-bornylamine or (+)-(1S,2S,5R)-menthylamine with various commercially available Cbz-protected amino acids. Among them, 2a can efficiently promote the Michael addition of nitroalkanes to a broad scope of enones with high yields (up to 96%) and excellent enantioselectivities (up to 98%) under mild conditions.
Organic & Biomolecular Chemistry
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