Acetic Acid → HCID 66747561, compound

Participants

Reaction Steps

Paraformaldehyde (29 mg, 0.10 mmol, 1.0 eq) is added at room temperature to a stirred solution of 6-({1-[2-(7-methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-ylamino}-methyl)-4H-benzo[1,4]thiazin-3-one (50 mg, 0.10 mmol, 1.0 eq) in 1,2-dichloroethane (2 mL) and methanol (0.5 mL), followed by acetic acid (7 μL, 0.12 mmol, 1.3 eq) and sodium cyanoborohydride (9 mg, 0.12 mmol, 1.3 eq). After 15 hours stirring at room temperature, the reaction mixture is extracted with dichloromethane (3×5 mL) and a saturated sodium hydrogen carbonate aqueous solution (5 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a residue that is purified by preparative HPLC to afford 6-[({1-[2-(7-methoxy-quinoxalin-2-yloxy)-ethyl]-piperidin-4-yl}-methyl-amino)-methyl]-4H-benzo[1,4]thiazin-3-one as a light brown viscous oil (11 mg, 21% yield).

Provenance & Evidence