Sodium hydride → (R)-3-(4-chlorobenzyloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester

Temperature

0 °C

A solution of (R)-3-hydroxy-pyrrolidine-1-carboxylic acid tert-butyl ester (1.14 mmol, 1.0 eq) in THF (2.5 mL) was added to a suspension of sodium hydride (1.15 eq) in THF (2.5 mL) cooled at 0° C. and the resulting mixture was stirred for 45 min. A solution of 4-chlorobenzyl bromide (1.31 mmol, 1.15 eq) in THF (2.0 mL) was then added drop wise and reaction mixture was slowly warmed to room temperature and stirred for 18 h. The reaction mixture was quenched with water (1.0 ml) and diluted with ethyl acetate. The combined organics were dried over sodium sulfate. The crude product was purified on silica using gradient elution from hexane/ethyl acetate (10%) to hexane/ethyl acetate (30%). 1H-NMR (CDCL3) δ: 1.45 (9H, s), 1.80–2.05 (2H, m), 3.30–3.55 (4H, m), 4.05 (1H, m), 4.45 (2H, s), 7.15–7.30 (4H, m). ESI-MS m/z:311 (M+1), UV retention time: 2.94 min.

1. customreaction mixture
2. temperaturewas slowly warmed to room temperature
3. stirringstirred for 18 h
4. customThe reaction mixture was quenched with water (1.0 ml)
5. additiondiluted with ethyl acetate
6. dry with materialThe combined organics were dried over sodium sulfate
7. customThe crude product was purified on silica using gradient elution from hexane/ethyl acetate (10%) to hexane/ethyl acetate (30%)

ORD record

ord-b664e5dd0c414d01991aa0d4e25ea546

Source dataset

uspto-grants-2007_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07271176B2