A simplified procedure for the N-acylation of oxazolidin-2-one chiral
auxiliaries has been developed. The acylations occur at room temperatu
re in the presence of triethylamine and cataytic quantities of 4-(N,N-
dimethylamino)pyridine, thereby eliminating the necessity for a strong
base such as butyllithium. Acylations with both symmetrical and mixed
anhydrides, as well as acid chlorides, occur with a wide variety of o
xazolidinone auxiliaries.