. The enantioselectivity of the amino oxazolines for aldol reaction is mainly controlled by the size and shape of the chiral substituent on the oxazoline ring and is almost independent of the group attached on the amino unit (Ar0). However, derivative 3 with a primary amino group as well as the benzoyl derivative 4 failed to catalyse this reaction. It is possible that in the former, the condensation of the aldehyde with a primary amine is a competing reaction while the neutral nature of the benzoyl derivative does not favour the enol formation in the latter case. It is also noteworthy that the acid labile amino oxazoline remains intact after