title: Asymmetric synthesis of beta-amino acid derivatives incorporating a broad range of substitution patterns by enolate additions to tert-butanesulfinyl imines.
abstract: Addition of Ti(Oi-Pr)(3) ester enolates to tert-butanesulfinyl aldimines and ketimines provided beta-substituted, alpha,beta- and beta,beta-disubstituted, alpha,beta,beta- and alpha,alpha,beta-trisubstituted, and alpha,alpha,beta,beta-tetrasubstituted beta-amino acid derivatives in high yields and with high diastereoselectivites. The N-sulfinyl-beta-amino ester products were further employed as versatile intermediates for both standard solution-phase and solid-phase synthetic transformations, including the synthesis of beta-peptide foldamers.
authors.affiliation: Center for New Directions in Organic Synthesis and the Department of Chemistry, University of California, Berkeley 94720-1460, USA.
authors.forename: Tony P
authors.initials: TP
authors.lastname: Tang
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Ellman
mesh_terms: D000596:Amino Acids / Q000138:chemical synthesis* / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D015394:Molecular Structure; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D000596:Amino Acids; D007097:Imines; D010455:Peptides