Fused polycyclic nitrogen-containing heterocycles 24. Three-component condensation of diethyl 2,4,6-trioxoheptanedicarboxylate with salicylaldehydes and ammonium acetate as a new method for the synthesis of 7- and 9-substituted benzo[e]pyrano[4,3-b]pyridines
Fused polycyclic nitrogen-containing heterocycles 24. Three-component condensation of diethyl 2,4,6-trioxoheptanedicarboxylate with salicylaldehydes and ammonium acetate as a new method for the synthesis of 7- and 9-substituted benzo[e]pyrano[4,3-b]pyridines