反应详情

To a solution of 5.00 g (8.2 mmol) of 3-trichloroacetyl-5-[N-tert-butoxycarbonyl-N-(4-pentafluoropropionamidobutan-1-yl)aminomethyl]imidazo[1,2-a]pyridine in 100 ml of ethanol was added 3.4 ml (41.0 mmol) of 12N hydrochloric acid. The mixture was stirred for one hour at room temperature. The solvent and an excess volume of hydrochloric acid were distilled off under reduced pressure. The residue was dissolved in a mixture of 50 ml of purified water and 50 ml of ethanol. The solution was neutralized with 2N aqueous solution of sodium hydroxide. This solution was extracted with 150 ml of dichloromethane. The organic layer was washed with 150 ml of a saturated aqueous saline solution, dried over magnesium sulfate, and distilled off the solvent under reduced pressure. The residue was purified by silica gel column chromatography (eluent; dichloromethane:methanol=20:1) to afford 2.11 g of the desired compound (66.1%, a pale yellow solid).

1. distillationThe solvent and an excess volume of hydrochloric acid were distilled off under reduced pressure
2. dissolutionThe residue was dissolved in a mixture of 50 ml of purified water and 50 ml of ethanol
3. extractionThis solution was extracted with 150 ml of dichloromethane
4. washThe organic layer was washed with 150 ml of a saturated aqueous saline solution
5. dry with materialdried over magnesium sulfate
6. distillationdistilled off the solvent under reduced pressure
7. customThe residue was purified by silica gel column chromatography (eluent; dichloromethane:methanol=20:1)