Sodium borohydride → (5-Aminobenzo[f][1,7]naphthyridin-8-yl)methanol

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 5-aminobenzo[f][1,7]naphthyridine-8-carboxylate (from the previous step) (1.0 eq.) in EtOH (0.03M) was added NaBH4 (10 eq.) at 25° C. The solution was heated to 80° C. for 5 hours. After cooling to ambient temperature, the reaction mixture was concentrated en vacuo. The residue was portionized between saturated NaHCO3 and EtOAc. The layers were separated and aqueous layer was extracted with EtOAc twice. The combined organic layer was washed with brine, dried over MgSO4 and concentrated en vacuo to obtain a crude residue. The crude material was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-10% MeOH/DCM to give (5-aminobenzo[f][1,7]naphthyridin-8-yl)methanol as an off white solid: 1H NMR (methanol-d4): δ 8.82 (dd, 1H), 8.77 (dd, 1H), 7.26 (d, 1H), 7.70 (dd, 1H), 7.50 (d, 1H), 7.27 (dd, 1H), 4.66 (s, 2H). LRMS [M+H]=226.1.

Provenance & Evidence