反应详情

(R)-1-(tert-Butoxycarbonyl)pyrrolidine-2-carboxylic acid (5.00 g, 23.2 mmol), O,N-dimethylhydroxylamine hydrochloride (2.49 g, 25.6 mmol), diisopropyl ethyl amine (8.09 mL, 46.5 mmol) and 2-(1H-7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyl uronium hexafluorophosphate methanaminium (“HATU”) (9.72 g, 25.6 mmol) in DCM (50 mL) were stirred at room temperature for 2 hours. The reaction mixture was quenched with water, and the layers were separated. The aqueous layer was extracted with DCM (1×), and the combined organics were dried, filtered and concentrated. The crude product was purified via column chromatography, eluting with hexanes/ethyl acetate (1:1) to give (R)-tert-butyl 2-(methoxy(methyl)carbamoyl)pyrrolidine-1-carboxylate as an oil (5.5 g, 92%). m/z (APCI-pos) (M+1)-Boc=159.0.

1. customThe reaction mixture was quenched with water
2. customthe layers were separated
3. extractionThe aqueous layer was extracted with DCM (1×)
4. customthe combined organics were dried
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude product was purified via column chromatography
8. washeluting with hexanes/ethyl acetate (1:1)