反应详情

To a stirred solution of (1S,4S)-5-(5-(3-thienyl)-3-pyridyl)-2-(tert-butoxycarbonyl)-2,5-diazabicyclo[2.2.1]heptane (0.63 g, 1.4 mmol) in anisole (3.0 mL) at 0-5° C. under a nitrogen atmosphere, trifluoroacetic acid (2.0 mL, 26 mmol) was added dropwise over a 10 min period. After 0.5 h at 25° C., the solution was adjusted to pH 5 using 10% NaOH, followed by extraction with diethyl ether (1×15 mL) to remove the anisole. The aqueous portion was adjusted to pH 11 using 10% NaOH, followed by extraction with diethyl ether (3×25 mL). The combined diethyl ether extracts were dried (Na2SO4) filtered and concentrated under vacuum. Purification of the residue by column chromatography on silica gel, using chloroform:methanol:triethylamine (40:5:1) as eluent, gave a light yellow oil (124 mg, 34%).

1. extractionfollowed by extraction with diethyl ether (1×15 mL)
2. customto remove the anisole
3. extractionfollowed by extraction with diethyl ether (3×25 mL)
4. dry with materialThe combined diethyl ether extracts were dried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customPurification of the residue by column chromatography on silica gel