Conjugate additions of 1-propenylphosphonates to metalated Schollkopf's bis-lactim ether: Stereocontrolled access to 2-amino-3-methyl-4- phosphonobutanoic acids

1. Ojea, V.
2. Ruiz, M.
3. Shapiro, G.
4. Pombo-Villar, E.