Water → 5-(2-dimethylamino-ethyl)-3-methyl-4-oxo-4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridine-2-carbaldehyde

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Reaction Conditions

Reaction Steps

A stirred solution of N,N-dimethylformamide (2 ml) was added dropwise slowly with phosphorus oxychloride (104 μl, 1.1 mmol) under an argon atmosphere while maintaining the temperature at 0° C. Upon completion of the addition, the mixture was stirred for 15 minutes at room temperature, and cooled down to 0˜5° C. in an ice-water bath. A mixture of 5-(2-dimethylamino-ethyl)-3-methyl-1,5,6,7-tetrahydro-pyrrolo[3,2-c]pyridin-4-one (221 mg, 1 mmol) in 1.2 ml of N,N-dimethylformamide was added dropwise to the above solution. Upon completion of the addition, the mixture was stirred for 2 hours at 0° C., added with cold water (15 ml), stirred for 5 minutes. The resulting mixture was adjusted to pH 12 with 10% aqueous sodium hydroxide solution and extracted with dichloromethane (15 ml×6). The combined organic extracts were washed with brine (15 ml), dried with anhydrous sodium sulfate; filtered and concentrated under reduced pressure. The residue was purified by silica gel column chromatography with triethylamine:methanol:dichloromethane (1:20:500) as eluents to give 5-(2-dimethylamino-ethyl)-3-methyl-4-oxo-4,5,6,7-tetrahydro-1H-pyrrolo[3,2-c]pyridine-2-carbaldehyde (105 mg, 38%) as a pink oil which was used as such.

Provenance & Evidence