Synthesis and 13C, 15N NMR study of a new functionalized pyrido[2,3-b]indole derivative†

New functionalized α-carbolinones especially the 4-hydroxy-3-nitro-1H,9H-pyrido[2,3-b]indol-2-one were synthesized in a good yield, three-step reaction. A complete 13C, 15N nmr study of this carbolinone and precursors is presented.