[H-].[Na+].[F:3][C:4]1[CH:5]=[C:6]([OH:10])[CH:7]=[CH:8][CH:9]=1.[CH3:11][NH:12][C:13]([N:15]1[CH2:18][CH:17](OS(C)(=O)=O)[CH2:16]1)=[O:14]>CN(C)C=O.O>[F:3][C:4]1[CH:5]=[C:6]([CH:7]=[CH:8][CH:9]=1)[O:10][CH:17]1[CH2:18][N:15]([C:13]([NH:12][CH3:11])=[O:14])[CH2:16]1A stirred slurry of 0.38 g (0.02 mole) of 60% sodium hydride as a mineral oil suspension in 10 ml of dry dimethylformamide was treated under nitrogen with the dropwise addition of 1.12 g (0.01 mole) of 3-fluorophenol in 20 ml of dimethylformamide. After 1 hr, the mixture was heated at 90° C. for 20 min then 2.1 g (0.01 mole) of N-methyl-3-[(methanesulfonyl)oxy]-1-azetidinecarboxamide was added as a solid. The reaction mixture was then stirred at 90° C. for 8 hr. The reaction mixture was cooled by adding ice water then further diluted to 200 ml with water and extracted with 3×50 ml of methylene chloride. Less than 1 g of oil was obtained upon concentrations of the extracts. Extraction with 4×50 ml of benzene gave only a trace of product. The mass spectrum (CI) showed the expected p+1 at 225 m/e. The product solidified on standing and was recrystallized from methanol/water to yield 650 mg (29.0%) of flake-like silver crystals, m.p. 156°-158° C.
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