Nivoliers, F.; Decormeille, A.; Godard, A.; Queguiner, G. published the artcile< 6H-indolo[3,2-b]naphthyridines. Aza-analogs of ellipticine>, Reference of 55279-29-3, the main research area is indolonaphthyridine; cyclocondensation indole aminopyridinecarboxaldehyde.
The indolonaphthyridines I (X = N, X1 = X2 = CH; X = X2 = CH, X1 = N; X = X1 = CH, X2 = N) were prepared by cyclocondensation of the indole II with the corresponding pyridines. E.g., II reacted with 1 mol equiv 3-aminopyridine-2-carboxaldehyde in MeOH/KOH at room temperature for 3 days gave I (X = N, X1 = X2 = CH). Quaternization of I with MeI occurred at the terminal pyridine ring.
Tetrahedron Letters published new progress about Cyclocondensation reaction. 55279-29-3 belongs to class pyridine-derivatives, and the molecular formula is C6H6N2O, Reference of 55279-29-3.