Formaldehyde → HCID 67448457, compound

Participants

Reaction Steps

A solution of (E)-9-[3-(3-aminopiperidin-1-yl)prop-1-enyl]-8-hydroxythieno[2,3-c]quinolin-4(5H)-one (60 mg, 0.15 mmol) and formaldehyde (37% in water, 13 mg, 0.44 mmol) in methanol (1 mL) was stirred at room temperature for 30 min followed by the addition of sodium cyanoborohydride (28 mg, 0.44 mmol). The reaction mixture was stirred at room temperature overnight, concentrated and partitioned between water and ethyl acetate. The layers were separated and the aqueous layer was extracted with methylene chloride. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated. The residue was purified by preparatory HPLC (C18 silica, water/acetonitrile w/0.05% TFA gradient) to afford the desired product (30 mg, 53%) as a yellow solid: 1H NMR (500 MHz, CD3OD) δ 7.97 (dd, J=19.4, 5.3 Hz, 2H), 7.30 (d, J=8.9 Hz, 1H), 7.23 (d, J=15.9 Hz, 1H), 7.07 (d, J=8.9 Hz, 1H), 6.33-6.22 (m, 1H), 4.32-4.18 (m, 3H), 3.90-3.77 (m, 2H), 3.47 (t, J=11.6 Hz, 1H), 3.18 (t, J=11.3 Hz, 1H), 3.01 (s, 6H), 2.40-2.23 (m, 2H), 2.10-1.84 (m, 2H).

Provenance & Evidence