The use of microwave energy in organic synthesis is becoming very popular and many reactions are becoming accessible. An advantage of microwave-catalyzed reactions, is that they can take place under solvent-free conditions (eco-friendly process) compared to conventional heating; in addition, lower reaction times and higher yields are generally obtained.

The procedures are easy to perform and the reactions can be conducted in solvent free conditions and lead to almost quantitative yields of products.

We report the microwave-assisted synthesis of an useful byproduct: 8-acetyl-7-hydroxy-4-methylcoumarin (see Fig. 1).

Fig. 1. Scheme of synthesis.

¹³C CP/MAS NMR spectra of compounds 1-3 were analyzed to elucidate the structural details.

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