反应详情

To a solution of (R)-1-(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid (11.93 g, 55.42 mmol) and DCM (70 mL) cooled to −15° C. was added a solution of NMM (5.79 g, 57.3 mmol), ethyl carbonochloridate (12.03 g, 110.8 mmol) and DCM (50 mL) and the mixture was stirred for 15 min. Additional NMM (11.59 g, 114.5 mmol) was added followed by portion wise addition of O,N-dimethylhydroxylamine hydrochloride (10.81 g, 110.8 mmol). The reaction was stirred at RT for 18 h. The reaction was poured onto water and extracted with DCM. The organic layer was dried, filtered, and concentrated and the crude residue was purified by SiO2 chromatography eluting with EtOAc/hexane (1:1) to afford 9.74 g (68.03%) of (R)-tert-butyl 2-(methoxy(methyl)carbamoyl)pyrrolidine-1-carboxylate (74).

1. stirringThe reaction was stirred at RT for 18 h
2. additionThe reaction was poured onto water
3. extractionextracted with DCM
4. customThe organic layer was dried
5. filtrationfiltered
6. concentrationconcentrated
7. customthe crude residue was purified by SiO2 chromatography
8. washeluting with EtOAc/hexane (1:1)