[2.2]Paracyclophane-Derived N-Acyloxazol-2(3H)-one as a Suitable Planar Chiral Auxiliary for the Enantioselective Synthesis of (beta)-Hydroxy Acids

The synthesis of optically active (+)-(R)-[2.2]paracyclophano[4,5-d]-oxazol-2(3H)-one is described. The aldol reaction of N-acyl derivatives of this planar chiral auxiliary with beazaldehyde occurs with good diastereo- and enantioselectivity.