C(OC([NH:8][CH2:9][CH2:10][C:11]([O:13][CH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[O:12])=O)(C)(C)C.[ClH:21]>O1CCOCC1>[ClH:21].[NH2:8][CH2:9][CH2:10][C:11]([O:13][CH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[O:12]Compound (25) (517 mg, 1.85 mmol) was treated with 4N HCl in dioxane at room temperature for 2 h. The reaction mixture was evaporated at reduced pressure, evaporated from toluene and then dried under vacuum to give crude benzyl β-alaninate hydrochloride which was used without further purification.
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