Oxidation of C–H bonds to CO bonds by O2 only or N-oxides and DMSO: synthesis of Δ1-bipyrrolinones and pyrrolino[3,2-b]pyrrolinones from 2,6-diazasemibullvalenes†
Abstract
2,6-Diazasemibullvalenes (NSBVs) readily reacted with oxygen under mild conditions, affording Δ1-bipyrrolinones via C–N bond cleavage and C–H bond