Dimethylamine → 4-(benzyloxy)-1-(2-(2-(dimethylamino)acetyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one

Participants

Reaction Steps

To a solution of 4-benzyloxy-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in CH2Cl2 (2 mL) was added 2-chloroacetyl chloride (29 μL, 0.36 mmol) and Et3N (0.1 mL, 0.7 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. After the solvent was removed, the residue was dissolved in DMF. To the DMF solution was added (CH3)2NH (64 μL, 1.2 mmol) and K2CO3 (166 mg, 1.2 mmol). The reaction mixture was heated to 70° C. and stirred at 70° C. until the reaction was complete. After it was cooled, the reaction was quenched with water and extracted with CH2Cl2. The organic layer was washed with H2O and 5% LiCl, dried with Na2SO4, filtered, and concentrated. Purification by flash column chromatography (silica gel, 10% CH3OH in CH2Cl2) gave 4-(benzyloxy)-1-(2-(2-(dimethylamino)acetyl)-5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (58 mg, 51%) as a yellow foam. The free base was converted to the HCl salt to give the title compound (31 mg, 50%) as a yellow solid and as a mixture of rotamers: mp 135-140° C.; 1H NMR (500 MHz, CD3OD) δ 7.75-7.71 (m, 1H), 7.59-7.55 (m, 1H), 7.49-7.37 (m, 6H), 7.05-7.01 (m, 1H), 6.49-6.45 (m, 1H), 6.28-6.26 (m, 1H), 5.24 (s, 2H), 4.87 (br s, 1H), 4.69 (br s, 1H), 4.44-4.41 (m, 2H), 4.11-4.07 (m, 1H), 3.85-3.82 (m, 1H), 3.70 (2×s, 3H), 3.06-2.92 (m, 2H), 2.97-2.94 (2×s, 6H); ESI MS m/z 471 [M+H]+; HPLC (Method B) 97.0% (AUC), tR=13.2 min.

Provenance & Evidence