The synthesis of the three alkoxymethyl-substituted acylsilanes 1-3 is described (Schemes 1 and 2). Their reactions with NaBH, as well as PhLi gave the corresponding alcohols with moderate to good diastereoisomeric induction (up to 78% de; see Table), depending upon the solvent used (Scheme 3 ) . The results indicate that in Et20, the reactions with PhLi proceed via 6-membered chelates (see C in Scheme 4 ) leading to the products with high de's (74-78%). In THF, these chelates are not formed, and as a consequence, the additions take place with reversed and lower stereoselectivities (34-50 % de).