In situ generation of 1,5-dipoles by concerted [1,6] hydrogen transfer. Stereoselective thermal rearrangement of 1-(1-pyrrolidinyl)-1,3-butadienes to pyrrolizines
In situ generation of 1,5-dipoles by concerted [1,6] hydrogen transfer. Stereoselective thermal rearrangement of 1-(1-pyrrolidinyl)-1,3-butadienes to pyrrolizines