Sodium Hydroxide → (S)-5-(2-Hydroxy-3-morpholin-4-yl-propyl)-3-methyl-4-oxo-1,4,5,6,7,8-hexahydro-pyrrolo[3,2-c]azepine-2-carbaldehyde

Participants

Reaction Steps

(Chloromethylene)dimethylammonium chloride (130 mg, 0.977 mmol) was dissolved in 3 ml of dichloromethane under stirring under an argon atmosphere, the solution was cooled to 0° C. in ice-water bath. (S)-5-(2-hydroxy-3-morpholin-4-yl-propyl)-3-methyl-5,6,7,8-tetrahydro-1H-pyrrolo[3,2-c]azepin-4-one 78e (300 mg, 0.977 mmol) was dissolved in 2 ml of dichloromethane under stirring, the resulting solution was added to the above solution while maintaining the temperature below 0° C. Upon the completion of addition, the reaction mixture was stirred for 20 minutes at room temperature. After thin lay chromatography showed the disappearance of starting materials, the reaction solution was added with sodium hydroxide solution (12 mol/L) to quench the reaction. The reaction solution was added with 10 ml of saturated brine, extracted with the mixture solvent of dichloromethane and methanol (V:V=10:1) (100 ml×3), the combined organic phase was washed with saturated brine (100 ml×1), dried over anhydrous magnesium sulfate, filtered to remove the drying agent, the filtrate was concentrated under reduced pressure, the residue was purified by silica gel column chromatography to obtain the title compound (S)-5-(2-Hydroxy-3-morpholin-4-yl-propyl)-3-methyl-4-oxo-1,4,5,6,7,8-hexahydro-pyrrolo[3,2-c]azepine-2-carbaldehyde 78f (200 mg, yield 61%) as a white solid.

Provenance & Evidence