[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]=1[C:19]([OH:21])=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C1C=CC2N(O)N=[N:28]C=2C=1.C(N=C=NCCCN(C)C)C.[OH-].[NH4+]>CN(C=O)C>[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]=1[C:19](=[O:21])[NH2:28])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a solution of 1.5 gm (5.2 mmol) of methyl 4-benzyloxy-3-carboxybenzoate in 8 mL of DMF is added 0.85 gm (6.2 mmol) of HOBT and 1.2 gm (6.2 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC). After 1 hr, 0.86 mL of 30% ammonium hydroxide is added, and the solution stirred for an additional 2 hr. The reaction mixture is concentrated to remove most of the DMF, and the residue is taken up in ethyl acetate. The ethyl acetate solution is washed with brine and dried over Na2SO4. Removal of solvent by rotoevaporation gives 1.37 gm (4.8 mmol) of methyl 4-benzyloxy-3-carbamoylbenzoate.
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