[CH2:1]([NH:8][CH2:9][C:10]([OH:12])=[O:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[ClH:13].[CH3:14]O>O1CCOCC1>[ClH:13].[CH2:1]([NH:8][CH2:9][C:10]([O:12][CH3:14])=[O:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To a N-benzyl glycine 26 (500 mg, 3.0 mmol) in MeOH (6 mL) was added 4M solution of HCl in dioxane (4 mL) and stirred overnight. The reaction mixture was concentrated to afford compound 27 (649 mg, 99%) as a white solid. The crude compound was carried forward without further purification. LRMS (ESI): (calc) 179.2 (found) 180.1 (MH)+.
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