反应详情

Into a 100-mL round-bottom flask, was placed a solution of (S)-methyl 3-(2-methylpyrrolidin-1-yl)-2-oxo-1,2-dihydroquinoxaline-6-carboxylate (900 mg, 3.14 mmol, 1.00 equiv), toluene (20 mL), thionyl chloride (11.2 g, 94.12 mmol, 30.00 equiv), N,N-dimethylformamide (4 mL). The resulting solution was heated to reflux for 3 hr in an oil bath. The resulting mixture was concentrated under vacuum. The residue was purified by silica gel column chromatography with ethyl acetate/petroleum ether (1:50). This resulted in 143 mg (13%) of (S)-methyl 2-chloro-3-(2-methylpyrrolidin-1-yl)quinoxaline-6-carboxylate as yellow oil.

1. customInto a 100-mL round-bottom flask, was placed
2. temperatureThe resulting solution was heated
3. temperatureto reflux for 3 hr in an oil bath
4. concentrationThe resulting mixture was concentrated under vacuum
5. customThe residue was purified by silica gel column chromatography with ethyl acetate/petroleum ether (1:50)
6. customThis resulted in 143 mg (13%) of (S)-methyl 2-chloro-3-(2-methylpyrrolidin-1-yl)quinoxaline-6-carboxylate as yellow oil