Enantioselective syn- and anti-Alkoxyallylation of Aldehydes via Brønsted Acid Catalysis.

A diastereo- and enantioselective alkoxyallylation via phosphoric acid catalysis was reported. Under the developed conditions, either 1,2- syn- or 1,2- anti-alkoxyallylation adducts were obtained in good yields with high enantioselectivities.