Hydrochloric Acid → (S)-8-((2-amino-4-methylpentyl)oxy)-6-(2-methoxyethyl)benzo[c][2,7]naphthyridin-5(6H)-one

Participants

Reaction Steps

To a solution of (S)-tert-butyl (1-((6-(2-methoxyethyl)-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridin-8-yl)oxy)-4-methylpentan-2-yl)carbamate (0.080 g, 0.170 mmol) in anhydrous methanol (5 mL) was added a 4M solution of HCl in 1,4-dioxane (0.21 mL, 0.85 mmol) dropwise at 0° C. The reaction mixture was allowed to warm to room temperature and stirred for 2 h. The reaction mixture was concentrated under reduced pressure to afford crude compound which was purified by preparative HPLC (10 mM ammonium acetate in water:acetonitrile) to afford (S)-8-((2-amino-4-methylpentyl)oxy)-6-(2-methoxyethyl)benzo[c][2,7]naphthyridin-5(6H)-one (20 mg, 0.054 mmol, 32% yield) a white solid. LC/MS (ESI) m/e 370.2 [(M+H)+, calcd for C21H28N3O3 370.2]; LC/MS retention time (method A): tR=1.34 min; HPLC retention time (method A): tR=8.36 min; HPLC retention time (method B): tR=8.78 min. 1H NMR (400 MHz, CD3OD) δ ppm 9.45 (s, 1H), 8.76 (d, J=5.77 Hz, 1H), 8.40 (d, J=9.03 Hz, 1H,), 8.23 (d, J=6.02 Hz, 1H), 7.29 (d, J=2.26 Hz, 1H), 7.11 (d, J=8.78 Hz, 1H), 4.61 (t, J=5.65 Hz, 2H), 4.36 (s, 1H), 4.20 (s, 1H), 3.81 (t, J=5.77 Hz, 2H), 3.63-3.71 (m, 1H), 3.37 (s, 3H), 1.86 (m, 1H), 1.67 (qt, J=14.01, 7.09 Hz, 2H), 1.06 (d, J=5.77 Hz, 6H).

Provenance & Evidence