The indium-mediated reaction of Z-protected α-amino aldehydes 1–6 with 2-(bromomethyl)acrylates 8/9 in aqueous solvents has been investigated. The preference for the formation of syn-configured homoallyl alcohols 10–16 (diastereoselectivities ranging from 2:1 to 32:1, yields 68–93%) may be explained by a chelate-controlled reaction. No racemization occurred during the preparation and transformation