Formaldehyde → HCID 86641331, compound

Participants

Reaction Steps

A mixture composed of di-tert-butyl {8-(cyclopropylamino)-2-[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]-2,7,8,9-tetrahydro-6-thia-1,2,3,5-tetraazabenzo[cd]azulen-4-yl}imidodicarbonate of Example 60 (400 mg), methanol (2 mL), a 35% formalin solution (111 μL), acetic acid (156 μL) and molecular sieves 3A was stirred at room temperature for 40 minutes. Then, sodium cyanoborohydride (163 mg) was added, and the mixture was stirred at room temperature for 14 hours. The molecular sieves were separated off by filtration, and then the solvent was evaporated under reduced pressure. The residue was dissolved in ethyl acetate, and the solution was washed with a saturated sodium bicarbonate solution and then with brine. The organic layer was dried over anhydrous sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. Dichloromethane (2 mL) and trifluoroacetic acid (2 mL) were added to the resulting residue, and the mixture was stirred at room temperature for one hour. The reaction mixture was concentrated under reduced pressure. A saturated sodium bicarbonate solution was added to the resulting residue under ice-cooling, followed by extraction with chloroform. The organic layer was dried over anhydrous sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (chloroform-methanol) to obtain the title compound (233 mg, 84%) as an oil.

Provenance & Evidence