[S:1](=[O:5])(=[O:4])([OH:3])[OH:2].CC(O)C.B.C(N)(C)(C)C.[CH3:16][O:17][C:18](=[O:27])[CH:19]=[C:20]([NH2:26])[CH2:21][C:22]([O:24][CH3:25])=[O:23]>C1COCC1>[S:1](=[O:3])(=[O:2])([OH:5])[OH:4].[CH3:25][O:24][C:22](=[O:23])[CH2:21][CH:20]([NH2:26])[CH2:19][C:18]([O:17][CH3:16])=[O:27]
A diluted alcoholic sulfuric acid solution is prepared by adding sulfuric acid (20.69 Kg) to i-PrOH (51.7 Kg) at 0-5° C. The resulting solution was slowly added to a solution of tert-butylamine borane (9.19 Kg) in THF (69.3 Kg), maintaining the temperature below −5° C. Dimethyl-3-aminoglutaconate (18.28 Kg) was slowly added to the resulting mixture, maintaining the temperature below 0° C. The resulting reaction mixture was stirred between 0° C. and 15° C. overnight, then quenched by slow addition to water (166 Kg) while maintaining the temperature below 10° C. and the pH between 5 and 7 by adding concentrated aqueous NaOH. The pH of the mixture was then adjusted to about 9-10 by adding concentrated aqueous NaOH at the end of the quenching process. The phases were separated and the aqueous phase was extracted with DCM. The combined organic extracts were washed with brine (20.6 Kg), filtered through a cotton cartridge and concentrated under reduced pressure to give 3-amino-pentanedioic acid dimethyl ester (17.87 Kg, 97% yield).
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