Asymmetric synthesis of (S)-3-methyleneglutamic acid and its N-Fmoc derivative via Michael addition–elimination reaction of chiral glycine Ni (II) complex with enol tosylates

1. Shigeno, Y.
2. Han, J.
3. Soloshonok, V.A.
4. Moriwaki, H.
5. Fujiwara, W.
6. Konno, H.