Synthesis of α,α,α′,α′-Tetrachloro-Δ1-bipyrrolines and 4,8-Dichloro-2,6-diazasemibuvallenes
摘要:
A series of 4,8-dichloro-2,6-diazasemibullvalenes were synthesized and isolated from the reaction of alpha,alpha,alpha' ,alpha'-tetrachloro-Delta(1)-bipyrrolines with lithium via C-N bond formation., All those dichlorodiazaseniibullvalene derivatives demonstrated extremely rapid aza=Cope rearrangement in solution. An unprecedented skeletal rearrangement of 4,8-dichloro-2,6-diazasemibullvalene derivatives took place, resulting in the formation of a new bipyrroline skeleton.