Silver-promoted cinnamamidyl radical-mediated oxidative cascade cyclization: highly regioselective synthesis of phosphorylated azaspiro[4.5]decenones

A silver-promoted oxidative cascade cyclization with a phosphorylation/1,5-aryl migration/desulfonylation/dearomatization process is presented here, providing an efficient method to synthesize azaspiro[4.5] decenones with high regioselectivity. The cinnamamidyl radical, which has rarely been reported before, plays a key role in this reaction.