Microwave accelerated efficient synthesis of N-fluorenylmethoxycarbonyl/t-butoxycarbonyl/benzyloxycarbonyl-5-oxazolidinones

The synthesis of N-protected 5-oxazolidinones using amino acids, paraformaldehyde and p-toluene sulfonic acid in a minimum amount of toluene accelerated by microwave irradiation for 3 min in high yield is described.