反应详情

First, to a solution in which 1.36 g of dibenzo[f,h]quinoxaline was dissolved in 20 mL of dichloromethane was added 2.04 g of 3-chlorobenzoic acid (abbreviation: MCPBA) in a nitrogen atmosphere, followed by stirring at room temperature for 1 week. Water was added to this mixture, and the organic layer was extracted with dichloromethane. The obtained organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and dried over anhydrous magnesium sulfate. Then, the resulting solution was filtered. The solvent of this solution was distilled off. The resulting residue was purified by silica gel column chromatography which uses a mixed solvent of dichloromethane and ethyl acetate as a developing layer. By recrystallization from dichloromethane, the object of the synthesis was obtained (as a white powder in a yield of 51%). The synthesis scheme of Step 1 is illustrated in the following (a″′-2-1).

1. extractionthe organic layer was extracted with dichloromethane
2. washThe obtained organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationThen, the resulting solution was filtered
5. distillationThe solvent of this solution was distilled off
6. customThe resulting residue was purified by silica gel column chromatography which
7. customBy recrystallization from dichloromethane
8. customthe object of the synthesis was obtained (as a white powder in a yield of 51%)
9. customThe synthesis scheme of Step 1