HCID 12736934, compound → HCID 12736935, compound

Participants

Reaction Steps

A suspension of ethyl 4,5-dihydro-4,5-dioxo-1H-1-benzopyrano[2,3-b]-pyridine-3-carboxylate (3.0 g, 0.011 mole) in 5N hydrochloric acid (100 ml) is refluxed under nitrogen for 16 hrs., cooled, filtered, washed with acetone and sucked dry. Recrystallization from DMF gives white crystals (2.51 g, 93%), mp 335°-340° C.

Provenance & Evidence