CC(C)([O-])C.[K+].[SH:7][CH2:8][CH2:9][CH2:10][NH:11][S:12]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)(=[O:14])=[O:13].Cl[C:22](Cl)=[CH:23][N+:24]([O-:26])=[O:25].Cl.[Cl-].[Na+]>C(O)(C)(C)C>[C:15]1([S:12]([N:11]2[CH2:10][CH2:9][CH2:8][S:7][C:22]2=[CH:23][N+:24]([O-:26])=[O:25])(=[O:14])=[O:13])[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=10.22 g of potassium t-butoxide was added drop-by-drop over 10 minutes to a solution of 0.23 g of 3 in 5 ml of t-butanol, under nitrogen. The resulting mixture was added drop-by-drop over 20 minutes to 0.30 g of 13A. After 20 minutes at room temperature, the mixture was poured into 2% hydrochloric acid saturated with sodium chloride, the resulting mixture was extracted with methylene chloride, the solvent was evaporated from the extract and the residue was purified over silica gel, using methylene chloride as eluent, to give 25, m.p.: 106°-107° C.
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