CC([O-])(C)C.[K+].[C:7]1([S:13]([CH2:16]Cl)(=[O:15])=[O:14])[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[CH3:18][O:19][C:20]1[CH:25]=[CH:24][C:23]([N+:26]([O-:28])=[O:27])=[CH:22][N:21]=1.C(O)(=O)C>O1CCCC1>[CH3:18][O:19][C:20]1[N:21]=[C:22]([CH2:16][S:13]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)(=[O:15])=[O:14])[C:23]([N+:26]([O-:28])=[O:27])=[CH:24][CH:25]=1A 1 M KOt-Bu solution in tetrahydrofuran (50 mL, 50 mmol) is cooled to −40° C., treated portion-wise with a solution of chloromethyl phenyl sulfone (4.39 g, 23.0 mmol) and then with a solution of 2-methoxy-5-nitropyridine (3.55 g, 23.0 mmol) in tetrahydrofuran, stirred for 45 min at −40° C., treated with glacial acetic acid (3.0 g, 50 mmol) and filtered. The filtercake is air-dried to give the title compound as a tan solid, 5.70 g (80% yield), mp 147-149° C., identified by mass spectral and HNMR analyses.
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