Benzyl chloroformate → Benzyl (3S)-3-[(tert-butoxycarbonyl)amino]pyrrolidine-1-carboxylate

HRID 338853Notes

Reaction equation

[NH:1]1[CH2:5][CH2:4][C@H:3]([NH:6][C:7](=[O:13])[O:8][C:9]([CH3:12])([CH3:11])[CH3:10])[CH2:2]1.CCN(C(C)C)C(C)C.Cl[C:24]([O:26][CH2:27][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)=[O:25]>ClCCl>[C:9]([O:8][C:7]([NH:6][C@H:3]1[CH2:4][CH2:5][N:1]([C:24]([O:26][CH2:27][C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)=[O:25])[CH2:2]1)=[O:13])([CH3:10])([CH3:12])[CH3:11]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of (S)-tert-butyl pyrrolidin-3-ylcarbamate (6.0 g, 32.2 mmol) and DIEA (12.5 g, 16.8 mL, 96.6 mmol) in dichloromethane (60 mL) cooled to 0° C. on an ice-bath was added benzyl chloroformate (8.7 g, 7.2 mL, 48.3 mmol), and the resulting mixture stirred at 0° C. for 2 hours. The mixture was diluted with dichloromethane (30 mL) and washed successively with cold aqueous 10% HCl, water, saturated sodium bicarbonate solution and brine. The organic phase was dried (MgSO4), filtered and concentrated under reduced pressure. The residue was purified by flash chromatography silica gel (Biotage, 65M; 20% ethyl acetate/hexanes) to afford (S)-benzyl 3-(tert-butoxycarbonylamino)pyrrolidine-1-carboxylate (10 g, 97%).

Workup

washwashed successively with cold aqueous 10% HCl, water, saturated sodium bicarbonate solution and brine
dry with materialThe organic phase was dried (MgSO4)
filtrationfiltered
concentrationconcentrated under reduced pressure
customThe residue was purified by flash chromatography silica gel (Biotage, 65M; 20% ethyl acetate/hexanes)

Sources & evidence

ORD record: ord-fc7886ff83d540fdaf43f91d24d2c0bc
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08889704B2

Reaction notes

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