C-centered Optically-active Organosilanes .2. Application To Enantioselective Allylation of Carbonyl-compounds

C-Centred optically active allylsilanes react with carbonyl compounds in presence of Lewis acids to give the corresponding homoallyl alcohols with ee varying from 21 to 56 %. The role of the Lewis acid is crucial for a correct development of the reaction; different procedures are tested and the results compared. Allylsilanes carrying a chiral ligand react with carbonyl compounds and Lewis acids to give the corresponding homoallyl alcohols with ee varying from 21 to 56%