Asymmetric addition of titanium and sodium alkoxides to chiral imines
摘要:
A novel method for the alkoxylation of imines was developed using alkoxytitanium(IV) derivatives as the alkoxy nucleophile donors. A rationale of the results obtained using stereochemical models is proposed. The differences in the stereochemical outcome of the reaction with the titanium species and sodium alkoxides were studied as well as the influence of chiral auxiliaries such as (2R)-bornano-10,2-sultam, (R)-8-phenylmenthol and 10-N,N-dicyclohexylsulphamoyl-(R)-isoborneol. (C) 2003 Elsevier Science Ltd. All rights reserved.