C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1.[CH3:18][N:19]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:20][CH:21]([C:32]1[CH:37]=[CH:36][C:35]([Cl:38])=[C:34]([Cl:39])[CH:33]=1)[O:22][CH2:23][CH2:24][O:25]C1CCCCO1>CO>[CH3:18][N:19]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:20][CH:21]([C:32]1[CH:37]=[CH:36][C:35]([Cl:38])=[C:34]([Cl:39])[CH:33]=1)[O:22][CH2:23][CH2:24][OH:25]0.56 g of pyridinium paratoluenesulfonate is added to a solution of 10 g of the compound obtained in EXAMPLE 8, step C), in 100 ml of MeOH and the reaction mixture is refluxed for 1 hour 15 minutes. It is concentrated under vacuum and the residue is taken up with ether, washed with water and with a buffer solution of pH 2, dried over MgSO4 and concentrated under vacuum to give 8.2 g of the expected product, which is used as such in the next step.
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