4-(Benzylamino)phenol → (R)-2-(4-Benzylamino-phenoxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

Temperatur

2.5 °C

To a solution of 4-(benzylamino)phenol (200 mg, 1 mmol) in DMF (3 mL) at 0-5° C. was added 60% NaH (48 mg, 1.2 mmol) at 0-5° C. The reaction mixture was stirred at rt for 15 min at 0-5° C. A solution of (R)-2-(Toluene-4-sulfonyloxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (356 mg, 1 mmol) in DMF (2 mL) was added to the above mixture at 0-5° C. The reaction mixture was warmed to rt and then heated at 90° C. for 15 h. The mixture was concentrated, diluted with saturated aq NaHCO3 and extracted with ethyl acetate. The aqueous layer was re-extracted with ethylacetate. The combined organic layers were dried over anhy. MgSO4 and the solvent was removed in vacuo to obtain the crude mixture, which was purified by silica gel flash chromatography to obtain the title product (169 mg, 44%).

1. temperatureThe reaction mixture was warmed to rt
2. temperatureheated at 90° C. for 15 h
3. concentrationThe mixture was concentrated
4. additiondiluted with saturated aq NaHCO3
5. extractionextracted with ethyl acetate
6. extractionThe aqueous layer was re-extracted with ethylacetate
7. customThe combined organic layers were dried over anhy
8. customMgSO4 and the solvent was removed in vacuo
9. customto obtain the crude mixture, which
10. customwas purified by silica gel flash chromatography

ORD-Eintrag

ord-ea988b50be044568bb02a8cf51470e37

Quelldatensatz

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07402684B2