Formaldehyde → HCID 44194755, compound

Participants

Reaction Steps

To a solution of 4-(benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) in CH3OH (3 mL) was added formaldehyde (30 μL, 0.29 mmol) and NaBH(OAc)3 (110 mg, 0.52 mmol). The reaction mixture was stirred at room temperature until the reaction was complete. Then the mixture was concentrated and the residue was dissolved in 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-(2,5-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-8-yl)pyridin-2(1H)-one (102 mg, 98%) as a yellow solid. The free base was converted to the HCl salt to give the title compound (100 mg, 90%) as a yellow solid: mp 264-268° C. (decompose); 1H NMR (500 MHz, DMSO-d6) δ 10.26 (s, 1H), 7.56-7.36 (m, 8H), 7.10 (dd, J=8.5, 1.5 Hz, 1H), 6.10 (dd, J=7.5, 3.0 Hz, 1H), 5.97 (d, J=3.0 Hz, 1H), 5.15 (s, 2H), 4.58 (m, 1H), 4.27 (m, 1H), 3.78 (m, 1H), 3.72 (s, 3H), 3.50 (m, 1H), 3.18 (m, 2H), 2.97 (s, 3H); ESI MS m/z 400 [M+H]+; HPLC (Method B)>99% (AUC), tR=12.9 min.

Provenance & Evidence