Enantioselective Addition of Vinylzinc Reagents to 3,4-Dihydroisoquinoline <i>N</i>-Oxide
作者:Sa Wang、Christopher T. Seto
DOI:10.1021/ol0614525
日期:2006.8.1
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.