C([O:3][C:4](=[O:21])[CH:5]([O:18][CH2:19][CH3:20])[C:6]([NH:8][CH2:9][C:10]1[CH:15]=[CH:14][C:13]([C:16]#[N:17])=[CH:12][CH:11]=1)=[O:7])C.[Li+].[OH-]>CO.O.C1COCC1>[C:16]([C:13]1[CH:12]=[CH:11][C:10]([CH2:9][NH:8][C:6](=[O:7])[CH:5]([O:18][CH2:19][CH3:20])[C:4]([OH:21])=[O:3])=[CH:15][CH:14]=1)#[N:17]A mixture of (RS)-N-(4-cyano-benzyl)-2-ethoxy-malonamic acid ethyl ester (1.97 g) and LiOH (285 mg) in MeOH (14 ml), H2O (7 ml) and THF (14 ml) was stirred 3 h at 60° C. The solvents were evaporated, EtOAc was added and it was washed with HCl 0.1 N, water and brine. The aqueous phases were extracted again with more EtOAc. The combined organic phases were dried (MgSO4) and the solvent was removed to yield (RS)-N-(4-cyano-benzyl)-2-ethoxy-malonamic acid, 1.53 g (86%); of white solid. MS 260.2 (100, [M+H]+), 277.2 (13, [M+NH4]+)
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