Photogenerated quinone methides as useful intermediates in the synthesis of chiral BINOL ligands

J Org Chem. 2006 May 12;71(10):3889-95. doi: 10.1021/jo060227y.

Abstract

The photoinduced synthesis of chiral 3,3'-CH2X-disubstituted BINOL ligands (X = NR2, SR, OH) has been achieved with excellent ee by UV-visible activation of BINOLAMs bearing L-proline ester arms. Quinone methides, detected by laser flash photolysis, are the key intermediates involved in such a synthetic protocol, which undergo reversible nucleophilic conjugate additions by a great variety of nitrogen nucleophiles (amines and alpha-amino acid derivatives) with complete configuration retention of the BINOL moiety.