反应详情

Into a 50-mL round-bottom flask, was placed a solution of (R)-methyl 3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylate (147.4 mg, 0.42 mmol, 1.00 equiv) in methanol (15 mL). This was followed by the dropwise addition of a solution of sodium hydroxide (84.5 mg, 2.11 mmol, 5.00 equiv) in water (2 mL) with stirring. The resulting solution was stirred overnight at 50° C. in an oil bath. The pH value of the solution was adjusted to 3-4 with 1N hydrogen chloride. The resulting mixture was concentrated under vacuum. The crude product (120 mg) was purified by Prep-HPLC with the following conditions (1#-Waters 2767-1): Column, SunFire Prep C18, 5 um, 19*100 mm; mobile phase, water with 0.05% TFA and CH3CN (20% CH3CN up to 50% in 6 min, up to 100% in 1 min, down to 20% in 1 min); Detector, UV 220 254 nm. This resulted in 35 mg (24%) of (R)-3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid.

1. customInto a 50-mL round-bottom flask, was placed
2. stirringThe resulting solution was stirred overnight at 50° C. in an oil bath
3. concentrationThe resulting mixture was concentrated under vacuum
4. customThe crude product (120 mg) was purified by Prep-HPLC with the following conditions (1#-Waters 2767-1)
5. waitup to 100% in 1 min
6. waitdown to 20% in 1 min)
7. customThis resulted in 35 mg (24%) of (R)-3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid