Readily Accessible 1,2-Amino Ether Ligands for Enantioselective Intramolecular Carbolithiation
摘要:
A new class of chiral 1,2-amino ether ligands, readily accessible from naturally occurring alpha-amino- or alpha-hydroxy acids, was found to provide high levels of both conversion and stereocontrol (up to 95:5 er) in intramolecular carbolithiation reactions, outperforming the benchmark ligand (-)-sparteine. The ligand could, be used in a substoichiometric amount (0.25 equiv) without significant loss of enantios electivity.
Readily Accessible 1,2-Amino Ether Ligands for Enantioselective Intramolecular Carbolithiation
摘要:
A new class of chiral 1,2-amino ether ligands, readily accessible from naturally occurring alpha-amino- or alpha-hydroxy acids, was found to provide high levels of both conversion and stereocontrol (up to 95:5 er) in intramolecular carbolithiation reactions, outperforming the benchmark ligand (-)-sparteine. The ligand could, be used in a substoichiometric amount (0.25 equiv) without significant loss of enantios electivity.
A new class of chiral 1,2-amino ether ligands, readily accessible from naturally occurring alpha-amino- or alpha-hydroxy acids, was found to provide high levels of both conversion and stereocontrol (up to 95:5 er) in intramolecular carbolithiation reactions, outperforming the benchmark ligand (-)-sparteine. The ligand could, be used in a substoichiometric amount (0.25 equiv) without significant loss of enantios electivity.