反应详情

To a stirred solution of 4-(5-hydroxymethyl-3-trifluoromethyl-pyridin-2-yl)-2-methyl-piperazine-1-carboxylic acid tert-butyl ester from step (f) above (3.75 g, 10 mmol) in dichloromethane (10 mL) was added trifluoroacetic acid (10 mL, Aldrich) dropwise at 0° C. over a period of 10 min. The mixture was stirred at room temperature for 16 h and diluted with toluene (20 mL). The solvents were removed in vacuo and the residue was dissolved in EtOAc (100 mL), washed with saturated aqueous solution of NaHCO3 (2×30 mL) and brine (20 mL), dried over Na2SO4, and filtered. The solvent was evaporated in vacuo and the residue was purified by silica gel column chromatography, eluting with 90:10:1 mixture of MeOH/CH2Cl2/ammonium hydroxide to give the title compound as a white solid. MS (ESI, pos. ion) m/e: 276 (M+1).

1. customThe solvents were removed in vacuo
2. dissolutionthe residue was dissolved in EtOAc (100 mL)
3. washwashed with saturated aqueous solution of NaHCO3 (2×30 mL) and brine (20 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. customThe solvent was evaporated in vacuo
7. customthe residue was purified by silica gel column chromatography
8. washeluting with 90:10:1 mixture of MeOH/CH2Cl2/ammonium hydroxide