Enantio- and diastereoselective synthesis of syn-beta-hydroxyallylsilanes via a chiral (Z)-gamma-silylallylboronate.

syn-beta-Hydroxyallylsilanes of general structure 11 and 28 are prepared in 50-86% yield and 91-95% ee (for aliphatic aldehydes; 50% ee for benzaldehyde) via the BF(3).Et(2)O-promoted gamma-silylallylboration reactions, using reagents 14 and 15.