Indium-mediated coupling of 3-bromopropenyl acetate with (S)-Garner aldehyde: a route to 1,4-dideoxy-1,4-l-iminoribitol

The indium organometallic complex generated by metallic indium and 3-bromopropenyl acetate in THF adds to the Garner aldehyde in excellent yield and with high diastereoselectivity; the usefulness of the corresponding anti–anti adduct was demonstrated by developing a short synthesis of the title compound, an azasugar known as a glycosidase inhibitor.