Hydrochloric Acid → HCID 57901578, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 1-(methoxymethyl)-7-{methyl[(4-nitrophenyl)sulfonyl]amino}-1H-indole-2-carboxylate (1.42 g) in ethanol (10 mL) was added 6N hydrochloric acid (10 mL), and the mixture was stirred at 70° C. for 12 hr. The reaction mixture was concentrated, water was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The obtained residue was dissolved in N,N-dimethylformamide (8 mL), lithium hydroxide (520 mg) and mercaptoacetic acid (430 μL) were added, and the mixture was stirred at room temperature for 12 hr. To the reaction mixture was added methyl iodide (100 μL), and the mixture was stirred at room temperature for 1 hr. Saturated aqueous sodium hydrogencarbonate solution was added to the reaction solution, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=1:1) to give a yellow amorphous (182 mg, yield 26%). M+1=219.

Provenance & Evidence