Thermal Cyclization of 2-Acyl-1-azido-3-phenalenones to Phenaleno[1,2-c]isoxazol-7-ones [1]

Article abstract of DOI:10.1002/jhet.5570350427

1-Azido-3-phenalenones 5 with acyl substituents in position 2, obtained by acylation and azidation of 1-hydroxy-3-phenalenones 1, cyclized by thermolysis to give phenaleno[1,2-c]isoxazol-7-ones 9. The thermolysis conditions were studied by differential scanning calorimetry.