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.
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