Enantioselective Organozinc Addition to Aldehydes Using Planar Chiral [2.2]Paracyclophane‐Imidazoline N,O‐Ligands.

We present an improved and convenient synthesis of [2.2]paracyclophane‐imidazoline N,O‐ligands with central and planar chirality in seven steps starting from [2.2]paracyclophane. The utility of these ligands in organozinc additions to aldehydes is described. The asymmetric ethylation of aldehydes proceeded with enantioselectivities of up to 97 % ee, while the asymmetric arylation of aldehydes gave up to 95 % ee (<italic>R</italic>) and 82 % ee (<italic>S</italic>) using (<italic>S</italic>,<italic>S</italic>,<italic>S</italic>P)‐UCD‐Imphanol and (<italic>S</italic>,<italic>S</italic>,<italic>R</italic>P)‐UCD‐Imphanol, respectively. [ABSTRACT FROM AUTHOR]