反应详情

To a solution of 2-(indol-2-yl)ethylamine (2.7 g) in acetic acid (25 ml) at 15° C. wa added sodium cyanoborohydride (2.22 g) in one portion. The solution was stirred at room temperature for 15 hours and diluted with chilled water. The mixture was made basic with sodium hydroxide pellets and extracted three times with ether. The ether layer was washed with brine, dried over anhydrous magnesium sulfate, and evaporated in vacuo to give 2-(2,3-dihydroindol-2-yl)ethylamine (1.41 g) as an oil. The oil was dissolved in tetrahydrofuran (50 ml) and treated with 1,1'-carbonyldiimidazole (1.13 g) at room temperature. The mixture was stirred at room temperature for 30 minutes. The reaction mixture was washed with brine, dried over anhydrous magnesium sulfate, and evaporated in vacuo. The residue was purified by silica gel column chromatography (30%-ethyl acetate-chloroform) to give crystals. The crystals were washed with ether to give 3,4,4a,5-tetrahydropyrimido[1,6-a]indol-1(2H)-one (0.74 g).

1. extractionextracted three times with ether
2. washThe ether layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customevaporated in vacuo