Oxalic Acid → 6-Bromo-1,4,7,8,9,10-hexahydro-9-(2-phenylethyl)pyrido[3,4-f]quinoxaline-2,3-dione

Participants

Reaction Steps

A solution of the product from Example 10 (0.54 g, 1.56 mmol) in 3N HCl (20 mL) was treated with oxalic acid (0.3 g, 2.34 mmol) and refluxed for four hours. When cool to room temperature the precipitate was filtered, suspended in water (70 mL) and basifyed to pH 10. The solids were filtered, and dried to give the title compound (0.37 g, 60%) as a brown solid, mp=290-295° C.

Provenance & Evidence