Abstract
AbstractA series of novel N‐squaramidoacid ligands were prepared conveniently. Without converting to corresponding amino alcohols, these ligands could be used in asymmetric borane reduction of prochiral aromatic ketones to give secondary alcohols in good to excellent enantiomeric excesses. The results showed that N‐squaramidoacids are more efficient ligands than N‐sulfonyl amino acids. N‐Squaryl proline was proved to be an excellent ligand in this catalytic asymmetric process.
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