C(OC([N:8]1[CH2:13][CH2:12][C:11]([O:20][CH3:21])([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH2:10][CH2:9]1)=O)(C)(C)C.[ClH:22]>CCOC(C)=O>[ClH:22].[CH3:21][O:20][C:11]1([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH2:10][CH2:9][NH:8][CH2:13][CH2:12]1A mixture of the ester from step (b) above (8.6 g) and saturated solution of hydrogen chloride in EtOAc (100 mL) was stirred at room temperature for 1 h. The solvent was removed in vacuo and the residue was washed with EtOAc, and dried in vacuo to give the title compound as a white solid. MS (ESI, pos. ion) m/z: 192 (M+1).
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