Two equivalents of vinylmagnesium bromide add to imines 1 in the presence of cerium trichloride to form homoallylic amines 3 as 2:1-adducts, Z-diastereomers being preferred by a margin of 88:12 to 71:29. Suitable chiral imines 1g-i are transformed to l-productsl-3g-i with high diastereoselectivity. © 1995.
Betz, J., & Heuschmann, M. (1995). A new α-selective synthetic equivalent for the crotyl anion in additions to imines. Tetrahedron Letters, 36(23), 4043–4046. https://doi.org/10.1016/0040-4039(95)00670-8