Bensulong, S.; Boonsombat, J.; Ruchirawat, S. DBU-mediated Regioselective Intramolecular Cyclization/Dehydration of ortho-Diketo Phenoxyethers: A Synthesis of 2,3-Substituted γ-Benzopyranones. Tetrahedron 2013, 69, 9335–9348.
Bensulong, S.; Boonsombat, J.; Ruchirawat, S. DBU-mediated Regioselective Intramolecular Cyclization/Dehydration of ortho-Diketo Phenoxyethers: A Synthesis of 2,3-Substituted γ-Benzopyranones. Tetrahedron 2013, 69, 9335–9348.