Abstract
An efficient two-step protocol for the synthesis of isoquinolones (isoquinolin-1(2H)-ones) has been developed based on the C–H annulation of benzoic acids with alkynes followed by the treatment of the isocoumarins formed with ammonium formate. This approach was applied for the synthesis of naturally occurring isoquinolone siaminine A. A comparative study of the optical properties revealed that isoquinolones display stronger luminescence emission than isocoumarins.
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