反应详情

To a solution of 6.0 g (16.3 mmol) (4R,9aR)-6-bromo-4-methyl-3,4,9,9a-tetrahydro-1H-2,4a,5-triaza-fluorene-2-carboxylic acid tert-butyl ester (Example 5, intermediate b) in 60 ml methanol were added 0.57 g (0.8 mmol) and 3.4 ml (2.5 g, 24.4 mmol) triethylamine and the reaction mixture was stirred at 80 deg C. for 24 h under a carbon monoxide atmosphere of 40 bar. The suspension was cooled to room temperature, poured into a mixture of water, ethyl acetate and brine and was extracted with further portions of ethyl acetate. The combined organic layers were separated, dried over magnesium sulfate and filtered. The residue was purified by chromatography on silica gel (0.032–0.063 mm) to afford the product as a light yellow foam (74.4%).

1. extractionwas extracted with further portions of ethyl acetate
2. customThe combined organic layers were separated
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. customThe residue was purified by chromatography on silica gel (0.032–0.063 mm)