Acetic Acid → HCID 44215055, compound

Participants

Reaction Steps

A dry flask containing 120 mg (0.21 mmol) of 1-(7-azabicyclo[2.2.1]hept-7-yl)-2-[2-(3,5-dimethylphenyl)-3-[2-[4-(pyridin-4-yl)butylamino]ethyl]-1H-indol-5-yl)-2-methylpropan-1-one (prepared essentially as described in EXAMPLE 2), 63.0 mg (2.1 mmol) of paraformaldehyde, and 200 mg of powdered 3A molecular sieves was fitted with a septum and purged thoroughly with nitrogen. Next, 5 mL of methanol and 0.121 mL (126.1 mg, 2.1 mmol) of glacial acetic acid were added, and the mixture was stirred at room temperature for 15 minutes. Then 52.8 mg (0.84 mmol) of sodium cyanoborohydride was added, followed after an additional 25 minutes by 2.5 mL of anhydrous tetrahydrofuran. After 1 day, the mixture was filtered, and the filter cake was washed thoroughly with methylene chloride. The filtrate was shaken in a separatory funnel with water. The aqueous phase was extracted an additional 3 times with methylene chloride. The combined organic fractions were dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was flash chromatographed on silica gel (gradient elution with 99:1:0.1 to 95:5:0.5 CH2Cl2-MeOH-concd. NH4O) to yield 95.4 mg (79%) of a yellow, stiff foam; homogeneous by TLC in 95:5:0.5 CH2Cl2-MeOH-concd. NH4OH. 500 MHz 1H NMR (CDCl3) was consistent with the assigned structure. Mass spectrum (ESI): m/e=577.5 (M+H).

Provenance & Evidence