[N+:1]([C:4]1[CH:5]=[C:6]([C:14]([O-:16])=O)[CH:7]=[C:8]([CH:13]=1)[C:9]([O:11][CH3:12])=[O:10])([O-:3])=[O:2].Cl.CN(C)CCCN=C=NCC.O.ON1C2C=CC=CC=2N=N1.C(N(CC)CC)C.[CH2:47]([NH:50][CH2:51][CH2:52][CH3:53])[CH2:48][CH3:49]>CN(C)C1C=CN=CC=1.ClCCl>[CH3:12][O:11][C:9](=[O:10])[C:8]1[CH:13]=[C:4]([N+:1]([O-:3])=[O:2])[CH:5]=[C:6]([C:14]([N:50]([CH2:51][CH2:52][CH3:53])[CH2:47][CH2:48][CH3:49])=[O:16])[CH:7]=1Dissolve commercially available monomethyl 5-nitroisophthalate (3.000 g, 14.07 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (3.238 g, 16.89 mmol), 1-hydroxybenzotriazole hydrate (2.587 g, 16.89 mmol) and 4-dimethylaminopyridine (0.172 g, 1.407 mmol) and triethylamine (5.885 mL, 42.22 mmol) in dichloromethane (309 mL) and stir the mixture at room temperature for 0.5 h. Add dipropylamine (2.026 mL, 14.78 mmol) and triethylamine (5.885 mL, 42.22 mmol) and stir the mixture overnight. Concentrate and redissolve the residue in ethyl acetate and wash with two portions each of 5% aqueous potassium hydrogen sulfate solution, 5% aqueous sodium bicarbonate solution, saturated aqueous sodium chloride, dry (magnesium sulfate) and concentrate to give the title compound (3.885 g, 90%).
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