A mixture of ethyl 7-(dibenzylamino)-1H-pyrrolo[2,3-c]pyridine-2-carboxylate (Reference Example 3) (634 mg, 1.64 mmol) and 3-(aminomethyl)pyridine (3.8 mL, 37 mmol) was heated neat at 100° C. for 72 h under N2. The mixture was cooled to room temperature and diluted with dichloromethane (150 mL) and water (100 mL). The layers were separated, and the aqueous layer was extracted with dichloromethane (2×50 mL). The combined organic extracts were dried (Na2SO4), filtered, and concentrated in vacuo. The residue was purified by chromatography (silica gel, gradient 50-70% ethyl acetate/hexanes) to provide 7-(dibenzylamino)-N-(3-pyridinylmethyl)-1H-pyrrolo[2,3-c]pyridine-2-carboxamide (364 mg, 49%) as an orange solid: Rf 0.08 (75:25 ethyl acetate/hexanes); mp 105-108° C.; 1H NMR (300 MHz, CDCl3) δ4.60 (2H, d, J=6.0 Hz), 4.89 (4H, s), 6.50 (1H, t, J=5.4 Hz), 6.71 (1H, s), 6.99 (1H, d, J=5.6 Hz), 7.28-7.31 (2H, m), 7.34-7.42 (9H, m), 7.64 (1H, d, J=7.8 Hz), 7.89 (1H, d, J=5.6 Hz), 8.55 (2H, s), 8.97 (1H, s); ESI MS m/z 448 [C28H25N5O+H]+; HPLC (Method A) >99% (AUC), tR=13.02 min.
