反应详情

温度

50 °C

Into a 50-mL round-bottom flask, was placed a solution of methyl 3-(isopropyl(methyl)amino)-2-(4-(trifluoromethoxy)phenyl)quinoxaline-6-carboxylate (120 mg, 0.29 mmol, 1.00 equiv) in methanol (15 mL), sodium hydroxide (57 mg, 1.43 mmol, 4.98 equiv), H2O (2 mL). The resulting solution was stirred for 2 hr at 50° C. in an oil bath. The resulting mixture was concentrated under vacuum and diluted with 20 mL of H2O. The pH value of the aqueous solution was adjusted to 4-5 with hydrogen chloride (2.5 mol/L). The resulting solids were collected by filtration. The crude product (100 mg) was purified by Prep-HPLC with the following conditions (1#-Waters 2767-1): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (65% CH3CN up to 85% in 8 min, up to 100% in 2 min); Detector, UV 220 254 nm. This resulted in 70 mg (60%) of 3-(isopropyl(methyl)amino)-2-(4-(trifluoromethoxy)phenyl)quinoxaline-6-carboxylic acid as a yellow solid.

1. customInto a 50-mL round-bottom flask, was placed
2. concentrationThe resulting mixture was concentrated under vacuum
3. additiondiluted with 20 mL of H2O
4. filtrationThe resulting solids were collected by filtration
5. customThe crude product (100 mg) was purified by Prep-HPLC with the following conditions (1#-Waters 2767-1)
6. waitmobile phase, water with 0.05% TFA and CH3CN (65% CH3CN up to 85% in 8 min
7. waitup to 100% in 2 min)
8. customThis resulted in 70 mg (60%) of 3-(isopropyl(methyl)amino)-2-(4-(trifluoromethoxy)phenyl)quinoxaline-6-carboxylic acid as a yellow solid