Sodium Hydroxide → 4-(2-Phenyl-cyclopropylcarbamoyl)-pyrrolidine-1,2-dicarboxylic acid 1-benzyl ester

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To a solution of 4-(2-Phenyl-cyclopropylcarbamoyl)-pyrrolidine-1,2-dicarboxylic acid 1-benzyl ester 2-methyl ester (422 mg, 1 mmol) in THF (2 mL) was added 1 N NaOH (1.5 mL) at 0° C. with stirring. After 30 min at 0° C. and 16 h at room temperature, the reaction mixture was concentrated and treated with EtOAc and 6 N HCl (5 mL). The organic layer was dried over MgSO4 and concentrated. The residue was purified by a silica gel column using CH2Cl2/MeOH (95:5) as eluant to yield the desired compound as a colorless oil (343 mg, 84%).

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