Tandem Zinc Mediated Reductive Cleavage-Reductive Amination as a New Approach to Substituted Pyrrolidines from Homoallylic Amines
N-Boc or N-Cbz homoallylic amines are converted in four steps into pyrrolidines through a sequence involving as a key-step a tandem zinc mediated reductive amination from an intermediate 1,3-oxazin-2-one