Ring Closing Metathesis for the Asymmetric Synthesis of (S)-Homopipecolic Acid, (S)-Homoproline and (S)-Coniine

Abstract
Diastereoselective conjugate addition of lithium (S)-N-allyl-N-α-methylbenzylamide to α,β-unsaturated esters or Weinreb amides, followed by ring closing metathesis is used to afford the cyclic β-amino acids (S)-homopipecolic acid and (S)-homoproline and the amine (S)-coniine in high ee.

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