[CH:1]([C:3]1[NH:4][C:5]([CH3:11])=[CH:6][C:7]=1[C:8]([OH:10])=O)=[O:2].C(N=C=NCCCN(C)C)C.ON1C2C=CC=CC=2N=N1.C(N(CC)CC)C.[CH2:40]([N:42]([CH2:46][CH3:47])[CH2:43][CH2:44][NH2:45])[CH3:41]>CN(C)C=O.C(=O)(O)[O-].[Na+].[Cl-].[Na+].O>[CH2:40]([N:42]([CH2:46][CH3:47])[CH2:43][CH2:44][NH:45][C:8]([C:7]1[CH:6]=[C:5]([CH3:11])[NH:4][C:3]=1[CH:1]=[O:2])=[O:10])[CH3:41]To a solution of 2-formyl-5-methyl-1H-pyrrole-3-carboxylic acid (320 mg, 2.1 mmol) in dimethylformamide (3 mL) was added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (483 mg, 1.2 equiv.), 1-hydroxybenzotriazole (340 mg, 1.2 equiv.), triethylamine (0.59 mL, 2 equiv.) and N,N-diethylethylenediamine (0.32 mL, 1.1 equiv.). After stirring at room temperature overnight, the reaction was diluted with saturated sodium bicarbonate and brine (with extra salt) and extracted with 10% methanol in dichloromethane. The combined organic layers were washed with brine, dried over anhydrous sodium sulfate and concentrated to give 2-formyl-5-methyl-1H-pyrrole-3-carboxylic acid (2-diethylaminoethyl)-amide.
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