CO[C:3]1[CH2:4][N:5]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:6][CH2:7][CH2:8][N:9]=1.[Cl-:17].[NH4+:18]>C(O)C>[ClH:17].[NH:18]=[C:3]1[N:9]=[CH:8][CH:7]=[CH:6][N:5]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:4]1To a stirred solution of imino methyl ether from Step A (1.75 g, 7.66 mmol) in ethanol was added ammonium chloride (0.4 g, 7.68 mmol). The resultant mixture was refluxed for 4 h. Concentration gave the title compound.
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