3,3‘-Oxazolidinyl-Substituted 2,2‘-Biphenyldiols: Novel Tropos Ligands with a Large Induction on the Chiral Axis
摘要:
A novel type of bisphenol ligand is presented which provides high modularity. Chiral information is introduced in the 3,3 '-positions as N-arenesulfonyl-1,3-oxazolidines inducing an unexpectedly high diastereoselectivity of up to 98: 2 onto the chiral axis. The impact of each part of the molecule on the diastereomeric ratio is evaluated with extended variable-temperature (VT) NMR studies. A first example of application in asymmetric catalysis is given.