反应详情

Under a N2 atmosphere, a solution of {(1R)-1-benzyl-2-[4-(5-fluoro-2-methoxy-phenyl)-1,2,3,6-tetrahydropyridin-1-yl]-ethyl}-methyl-amine (0.17 g, 0.48 mmole, described as intermediate 12 above) and triethylamine (0.15 mL, 1.0 mmole) in dichloromethane (10 mL) was cooled to 0° C. and a solution of cyclohexyl isocyanate (0.070 mL, 0.51 mmole) was added dropwise. The resulting mixture was stirred at 0° C. to room temperature (ice melt) overnight. The solvent was evaporated and the residue dissolved in EtOAc (25 mL) and water (25 mL). The layers were separated and the organics washed with water (25 mL), brine (30 mL) and dried over Na2SO4. Filtration and concentration gave the crude product which was purified by flash chromatography (elution with EtOAc) to yield 0.19 g (83% yield) of 1-{(1R)-1-benzyl-2-[4-(5-fluoro-2-methoxy-phenyl)-1,2,5,6-tetrahydro-4H-pyridin-1-yl]-ethyl}-3-cyclohexyl-1-methyl-urea. An ethanolic solution of the product was heated to gentle reflux and 1 equivalent of fumaric acid in hot ethyl alcohol solution was added to afford the fumarate salt of the titled compound as a white solid.

1. customThe solvent was evaporated
2. dissolutionthe residue dissolved in EtOAc (25 mL)
3. customThe layers were separated
4. washthe organics washed with water (25 mL), brine (30 mL)
5. dry with materialdried over Na2SO4
6. filtrationFiltration and concentration
7. customgave the crude product which
8. customwas purified by flash chromatography (elution with EtOAc)