[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[NH:9][C:10]1[CH2:14][CH2:13][N:12](S(C2C=CC(C)=CC=2)(=O)=O)[N:11]=1.[O-]CC.[Na+]>O>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[NH:9][C:10]1[CH:14]=[CH:13][NH:12][N:11]=1The product of step (a) (7.5 g) was added to a solution of sodium ethoxide (60 ml, prepared from 0.6 g sodium), at a temperature of 60°. The mixture was refluxed for 10 minutes, cooled, added to water, extracted with ethyl acetate, dried and evaporated to give the sub-title compound as a purple oil, ms 189 (M+).
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