反应详情

3-Carboethoxy-2,6-dimethyl-8-(2-ethyl-6-methylbenzylamino)imidazo[1,2-a]pyridine (1.0 g 2.8 mmol) was added to tetrahydrofuran (25 ml) and was stirred at +5° C. Lithium aluminum hydride (0.5 g, 13 mmol) was added in portions during 1.5 h so that the temperature remained below +10° C. After stirring the mixture at room temperature for an additional 1 h, 0.5 ml of water was added dropwise, followed by 0.5 ml of 15% sodium hydroxide and then 1.5 ml of water. The solids were removed by filtration and washed thoroughly with tetrahydrofuran and methylene chloride. The filtrate and washings were combined and dried and the solvents were removed under reduced pressure. The residue was solved in methylene chloride and washed with water. The organic layer was separated, dried over sodium sulfate, evaporated under reduced pressure and the residue was purified by column chromatography on silica gel using ethylacetate:methylene chloride (1:1) as eluent. Crystallization from petroleum ether:diethyl ether (1:1) gave 0.37 g (41%) of the title compound.

1. customremained below +10° C
2. stirringAfter stirring the mixture at room temperature for an additional 1 h
3. customThe solids were removed by filtration
4. washwashed thoroughly with tetrahydrofuran and methylene chloride
5. customdried
6. customthe solvents were removed under reduced pressure
7. washwashed with water
8. customThe organic layer was separated
9. dry with materialdried over sodium sulfate
10. customevaporated under reduced pressure
11. customthe residue was purified by column chromatography on silica gel
12. customCrystallization from petroleum ether:diethyl ether (1:1)