Cl.[NH2:2][CH2:3][C:4](=O)[CH2:5][CH2:6][CH2:7][C:8]([OH:10])=[O:9].[OH-].[Na+].[C:14]([O:20][CH2:21][CH3:22])(=[O:19])[CH2:15][C:16]([CH3:18])=O.C([O-])([O-])=O.[Na+].[Na+]>P([O-])(O)(O)=O.[Na+].O>[CH2:21]([O:20][C:14]([C:15]1[C:4]([CH2:5][CH2:6][CH2:7][C:8]([OH:10])=[O:9])=[CH:3][NH:2][C:16]=1[CH3:18])=[O:19])[CH3:22]
6-amino-5-oxohexanoic acid hydrochloride (S1) 22.44 g (0.12 mol) (Lartillot, Serge. et al, Bulletin de la Societe Chimique de France, 1964, 4:783) was solved in about 6.1 L sodium dihydrogen phosphate buffer (300 g sodium dihydrogen phosphate was solved in 6 L water, then Saturated sodium hydroxide aqueous solution was added until a pH of about 6.5 was reached), and ethyl acetoacetate 16.12 g (0.12 mol) was added to the above-mentioned solution. The reaction solution was refluxed for half an hour, cooled to room temperature and Na2CO3 was added until a pH of about 8 was reached. The mixture was extracted with 100 ml CHCl3 and Aqueous phase was acidified with 6 mol/L HCl to pH 1. The brown solid was collected by filtration, washed with water and dried in vacuum condition to give 20.29 g (71%) 4-(4-(ethoxycarbonyl)-5-methyl-1H-pyrrol-3-yl)butanoic acid (S2).
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