[CH2:1]([NH2:3])[CH3:2].[C:4]([C:7]1[CH:15]=[CH:14][CH:13]=[C:12]2[C:8]=1[CH2:9][C:10](=[O:16])[NH:11]2)(O)=[O:5].C1CN([P+](ON2N=NC3C=CC=CC2=3)(N2CCCC2)N2CCCC2)CC1.F[P-](F)(F)(F)(F)F>CN(C)C=O.CN(C)C1C=CN=CC=1>[CH2:1]([NH:3][C:4]([C:7]1[C:8]2[CH2:9][C:10](=[O:16])[NH:11][C:12]=2[CH:13]=[CH:14][CH:15]=1)=[O:5])[CH3:2]
Ethylamine (2.1 mL of 2.0 M solution in tetrahydrofuran, 4.2 mmol) was added dropwise to a suspension of 4-carboxy-2-oxindole (380 mg, 2.1 mmol) in dimethylformamide (8 mL), followed by 4-dimethylaminopyridine (385 mg, 3.15 mmol) and PyBOP (2.185 g, 4.2 mmol). The mixture was stirred at room temperature for 6 hrs. The reaction was concentrated. The residue was dissolved in dichloromethane, washed with saturated sodium bicarbonate and brine, dried, concentrated and recrystallized to give 280 mg (65%) of 2-oxo-2,3-dihydro-1H-indole-4-carboxylic acid ethylamide.
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