反应详情

To a solution of methyl 2-(4-(2-fluorophenyl)pyridin-3-ylamino)acetate (272 mg, 1.05 mmol; example 196, intermediate) in CH2Cl2 (3 mL) was added 3-(methylsulfonyl)-5-(trifluoromethyl)benzoic acid (280 mg, 1.05 mmol, example 114, intermediate a) and 2-bromo-1-ethylpyridinium tetrafluoroborate (343 mg, 1.25 mmol) and N,N-diisopropylethylamine (270 mg, 365 μL, 2.09 mmol). The reaction mixture was stirred at room temperature for 22 hours and then concentrated under vacuum. The residue was dissolved in 30 mL 1M aqueous HCl and 30 mL EtOAc and the layers were separated. The aqueous layer was extracted a second time with 30 mL EtOAc. The organic layers were washed with 30 mL 1M aqueous HCl and 30 mL 10% aqueous NaHCO3 and 30 mL brine, dried over MgSO4, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography on a 20 g column using an MPLC (Flashmaster) system eluting with a gradient of n-heptane:EtOAc (100:0 to 0:100). Light brown foam (323 mg, 61%). MS (ESI): m/z=511.094 [M+H]+.

1. concentrationconcentrated under vacuum
2. dissolutionThe residue was dissolved in 30 mL 1M aqueous HCl
3. custom30 mL EtOAc and the layers were separated
4. extractionThe aqueous layer was extracted a second time with 30 mL EtOAc
5. washThe organic layers were washed with 30 mL 1M aqueous HCl and 30 mL 10% aqueous NaHCO3 and 30 mL brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated under vacuum
9. customThe residue was purified by silica gel chromatography on a 20 g column
10. washeluting with a gradient of n-heptane:EtOAc (100:0 to 0:100)