title: Enantioselective addition of vinylzinc reagents to 3,4-dihydroisoquinoline N-oxide.
abstract: Ligand 2a promotes the enantioselective addition of vinylzinc reagents to 3,4-dihydroisoquinoline N-oxide to yield chiral allylic hydroxylamines. With 0.1 equiv of the ligand, the product is obtained in up to 84% ee, whereas with 1.2 equiv of the ligand, the ee is increased to the 90-95% range with a variety of aliphatic, cyclic, and aromatic vinylzinc reagents. This method was used to synthesize the protected unnatural amino acid N-Cbz-d-1,2,3,4-tetrahydroisoquinoline-1-carboxylic acid in three steps from the allylic hydroxylamine.
authors.affiliation: Department of Chemistry, Brown University, 324 Brook Street Box H, Providence, RI 02912, USA.
authors.forename: Sa
authors.initials: S
authors.lastname: Wang
authors.forename: Christopher T
authors.initials: CT
authors.lastname: Seto