Lawesson's reagent and microwaves: A new efficient access to benzoxazoles and benzothiazoles from carboxylic acids under solvent-free conditions

1. Seijas, J.A.
2. Vázquez-Tato, M.P.
3. Carballido-Reboredo, M.R.
4. Crecente-Campo, J.
5. Romar-López, L.