A nickel catalyst for the allylboration of aldehydes is reported, facilitating the
preparation of homoallylic alcohols in high diastereoselectivity. The observed diastereoselectivities
and NMR experiments suggest that allylation occurs through a well-defined six-membered
transition state, with nickel acting as a Lewis acid.
Key words
allylboration - boronic esters - catalysis - homoallylic alcohols - nickel