Acetaldehyde → HCID 57950373, compound

Participants

Reaction Steps

To a solution of 4-(benzyloxy)-1-(9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride (120 mg, 0.28 mmol) in dichloromethane/acetic acid (1% acetic acid, 10 mL) were sequentially added acetaldehyde (0.50 mL, 13 mmol) and NaBH(OAc)3 (1.0 g, 4.7 mmol). The reaction mixture was stirred at ambient temperature for 1 h. The mixture was concentrated, and the residue was purified by flash chromatography (silica gel silica gel, (1:1 hexanes/EtOAc)/(10:1:0.1 dichloromethane/methanol/concentrated ammonium hydroxide), 1:0 to 0:1) to provide 4-(benzyloxy)-1-(2-ethyl-9-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one (120 mg, 72%) as a white solid. The free base was converted to the HCl salt using 1.25 M HCl in methanol, providing the title compound (120 mg, 95%) as an off-white solid: 1H NMR (500 MHz, DMSO-d6) δ 7.57 (d, J=7.5 Hz, 1H), 7.54-7.34 (m, 7H), 6.97 (d, J=8.0 Hz, 1H), 6.10 (dd, J=7.5, 2.0 Hz, 1H), 5.97 (s, 1H), 5.16 (s, 2H), 3.67 (s, 3H), 3.45-3.18 (4H, overlapping with solvent peak), 3.26 (br m, 2H), 2.96 (m, 2H), 1.33 (br m, 3H); ESI MS m/z 414 [M+H]+; HPLC (Method A) 95.7% (AUC), tR=14.6 min.

Provenance & Evidence