Transamination of Zwitterionic Quinones with Polyamines: The Carbon Bridge Matters
Abstract
The one-pot transamination reactions on a zwitterionic benzoquinonemonoimine yield either a quinoxaline derivative or bis-zwitterionic macrocycles, depending on the number of carbon atoms bridging primary polyamines. These latter products, featuring two confined donor cavities are the result of a [2+2] condensation without the need for template effect nor high dilution conditions.