[NH2:1][CH2:2][CH2:3][CH2:4][C:5]([OH:7])=[O:6].[OH-].[Na+].C([O:14][C:15](OC(OC(C)(C)C)=O)=[O:16])(C)(C)C.O.[C:26](O)([CH3:29])([CH3:28])[CH3:27]>>[C:5]([CH2:4][CH2:3][CH:2]([NH2:1])[C:15]([OH:16])=[O:14])([O:7][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:6]4-Aminobutanoic acid (1 g, 9.7 mmol) was dissolved in tert-butyl alcohol (15 ml), 5N NaOH (1.93 ml, 9.7 mmol) was added thereto, and the mixture was stirred at room temperature for 10 minutes. Di-tert-butyl-dicarbonate (2.33 g, 10.7 mmol) dissolved in tert-butylalcohol (17 ml) was added thereto and stirred for 24 hours at room temperature. Water (12 ml) was added thereto and the resultant was concentrated under a reduced pressure and cooled to 0° C. Then, 2N H2SO4 was added thereto dropwise until pH of the mixture became 2. The resultant was extracted with ethyl acetate and the extract was washed with water. The organic layer was dried over MgSO4 and concentrated to obtain the title compound (2.1 g) as a white solid.
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