Acetic Acid → [2-(4-Isopropylpiperazin-1-yl)benzothiazol-5-yl-methyl]dimethylamine

Participants

Reaction Steps

To a solution of 2-(4-isopropylpiperazin-1-yl)benzothiazole-5-carbaldehyde (500 mg, 1.73 mmol) and dimethylamine hydrochloride (282 mg, 3.46 mmol) in THF (27.5 mL) and MeOH (13.7 mL) was added acetic acid (166 mg, 2.77 mmol), followed by NaCNBH3 (160 mg, 2.77 mmol). The mixture was heated at reflux overnight. The mixture was concentrated under reduced pressure, neutralized with an aqueous solution of Na2CO3 to pH 7, and filtered. The residue was extracted with dichloromethane (3×10 mL). The combined organic extracts were washed with brine, dried (Na2SO4) and concentrated. The residue was purified by preparative HPLC to give 251 mg (46%) of [2-(4-isopropylpiperazin-1-yl)benzothiazol-5-yl-methyl]dimethylamine as a trifluoroacetate salt.

Provenance & Evidence