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.
通过(S)-N-烯丙基-N-α-甲基
苄胺锂的对映选择性共轭加成到α,β-不饱和酯或Weinreb酰胺上,然后进行环合复分解反应,可以高度对映选择性地获得环状β-
氨基酸(S)-高哌考酸和(S)-高脯
氨酸以及胺(S)-
毒芹碱。