Lithium hydroxide, monohydrate → 4-(Tert-butoxycarbonylamino)-2-(4-chlorophenyl)-4-methylpentanoic acid

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Reaction Steps

Lithium hydroxide hydrate (6.44 mL, 232 mmol) was added to a stirred solution of tert-butyl 4-(4-chlorophenyl)-2,2-dimethyl-5-oxopyrrolidine-1-carboxylate (7.5 g, 23.2 mmol) in THF/MeOH/H2O (30 mL/30 mL/30 mL) at room temperature. The mixture was stirred at room temperature overnight and concentrated in vacuo. The mixture was taken up into water (200 mL), washed with EtOAc (100 mL), acidified with concentrated HCl and extracted into EtOAc (2×200 mL). The mixture was dried over Na2SO4 and concentrated in vacuo. Residual HCl was removed by evaporating from toluene to give 4-(tert-butoxycarbonylamino)-2-(4-chlorophenyl)-4-methylpentanoic acid (5.0 g, 63.2% yield) as a white solid. LCMS (APCI+) [M−Boc+H]+ 242.0; Rt: 2.8 min.

Provenance & Evidence