Methanamine, hydrochloride (1:1) → HCID 66924943, compound

Participants

Reaction Steps

A solution (15 mL) of methyl 1-[(3-chlorophenyl)sulfonyl]-4-methyl-5-phenyl-1H-pyrrole-3-carboxylate (700 mg) in tetrahydrofuran was cooled to −78° C., a 1.5 mol/L toluene solution (4.3 mL) of diisobutylaluminum hydride was added dropwise, and the mixture was further stirred at −78° C. for 30 min. 1 mol/L Hydrochloric acid (20 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. A solution (20 mL) of the residue in acetonitrile was cooled to 0° C., tetra-n-propylammonium perruthenate (76 mg), N-methylmorpholine N-oxide (377 mg) and molecular sieves 4A powder (1.5 g) were added, and the mixture was stirred at room temperature for 2 hr. The reaction mixture was concentrated under reduced pressure, the residue was suspended in ethyl acetate, and the suspension was filtered through celite. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate=9:1→2:1) to give 1-[(3-chlorophenyl)sulfonyl]-4-methyl-5-phenyl-1H-pyrrole-3-carbaldehyde as a brown solid (yield 565 mg, 88%). 1-[(3-Chlorophenyl)sulfonyl]-4-methyl-5-phenyl-1H-pyrrole-3-carbaldehyde (560 mg) was dissolved in methanol (25 mL), and methylammonium chloride (1.05 g) and sodium cyanoborohydride (294 mg) were added. The mixture was stirred at room temperature for 1 hr, and concentrated under reduced pressure. The residue was dissolved in water, and the solution was alkalized with a saturated aqueous sodium hydrogencarbonate solution and extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by basic silica gel column chromatography (eluent: hexane-ethyl acetate=9:1→ethyl acetate). The obtained oil was dissolved in ethyl acetate (5 mL), and a 4 mol/L hydrogen chloride-ethyl acetate solution (0.5 mL) was added. The precipitated crystals were collected by filtration and vacuum-dried to give the title compound as a colorless solid (yield 154 mg, 24%).

Provenance & Evidence