Direct α-amination of nitrones achieved by DBU-activated N -haloimides
作者:Mengru Li、Fushun Liang
DOI:10.1016/j.tetlet.2016.07.036
日期:2016.8
Direct α-amination of nitrones has been developed by using N-haloimide-DBU protocol. Reaction of nitrones with N-haloimide takes place readily in the presence of DBU in DCM, affording directly α-aminonitrones in moderate to excellent yields. N-Haloimide activated by DBU provides both a halogen cation and a nitrogen anion source. E- and Z-isomerization of α-aminonitrones was examined and found to be