CO[CH:3](OC)[CH2:4][C:5]1[N:13]=[CH:12][CH:11]=[CH:10][C:6]=1[C:7]([NH2:9])=[O:8].[NH+]1C=CC=CC=1.C1(C)C=CC(S([O-])(=O)=O)=CC=1>C1C=CC=CC=1>[N:13]1[C:5]2[CH:4]=[CH:3][N:9]=[C:7]([OH:8])[C:6]=2[CH:10]=[CH:11][CH:12]=1The product from Example 36c (1.36 g, 6.47 mmol) was dissolved in benzene (35 ml) and to this solution was added pyridinium-para-toluenesulfonate (0.20 g, 0.8 mmol). The mixture was heated to reflux for 23 h then concentrated under vacuum to give the title compound in quantitative yield sufficiently pure for use as isolated.
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