A silver-catalyzed dearomative decarboxylative [3+2] spiroannulation of aryl oxamic
acids with alkynes is described. The reaction provides reliable access to a range
of azaspiro[4,5]trienones in moderate yields in aqueous media. In addition, the reaction
exhibits a broad substrate scope and good functional group compatibility.
Key words
silver-catalyzed - dearomative - [3+2] spiroannulation - oxamic acid - alkyne - azaspiro[4,5]trienone