Methylamine → tert-butyl{[1-(6-chloro-5-methyl-3-pyridinesulfonyl)-5-phenyl-1H-pyrrol-3-yl]methyl}methylcarbamate

1-[(6-Chloro-5-methylpyridin-3-yl)sulfonyl]-5-phenyl-1H-pyrrole-3-carbaldehyde (244 mg) was dissolved in absolute tetrahydrofuran (6.8 mL), a 2 mol/L solution (0.34 mL) of methylamine in tetrahydrofuran was added, and the mixture was stirred at room temperature for 4 hr. The reaction mixture was added to a solution of sodium borohydride (51 mg) in methanol (3 mL), and the mixture was stirred at the same temperature for 3 min. di-tert-Butyl bicarbonate (654 mg) was added, and water (5 mL) and sodium hydrogencarbonate (420 mg) were added 3 min later. The mixture was further stirred at room temperature for 30 min, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=19:1→3:1) to give the title compound as an oil (yield 247 mg, 77%).

1. additionwas added
2. stirringThe mixture was further stirred at room temperature for 30 min
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. customthe solvent was evaporated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=19:1→3:1)

ORD-Eintrag

ord-29e2b0c654af4f3992e33d275e00bf8b

Quelldatensatz

uspto-grants-2011_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07977488B2