Aluminium lithium hydride → (2R,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(3-hydroxy-propyl)-pyrimidin-2-yl]-amino}-2-ethyl-pyrrolidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

1.0M solution of LAH (1.7 ml, 1.7 mmol) in diethylether solution is added to (2R,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(2-methoxycarbonyl-ethyl)-pyrimidin-2-yl]-amino}-2-ethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (350 mg, 0.58 mmol) in diethylether (8 ml) at 0° C., and this mixture is stirred for 0.5 hour at the same temperature. The reaction mixture is quenched with saturated ammonium chloride solution. The product is extracted three times with EtOAc. The combined organic layer is washed with 1N HCl, sat NaHCO3 aq. and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue is purified by column chromatography on silica gel (eluent: n-hexane/EtOAc) to give (2R,4S)-4-{(3,5-bis-trifluoromethyl-benzyl)-[5-(3-hydroxy-propyl)-pyrimidin-2-yl]-amino}-2-ethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (0.25 g, 74%).

Provenance & Evidence