C([N:14]1[C:17](=[O:18])[C@H:16]([N:19]=[N+:20]=[N-:21])[C@@H:15]1[C:22]([O:24][CH2:25][CH2:26][CH2:27][CH3:28])=[O:23])(C1C=CC=CC=1)C1C=CC=CC=1.S(OOS([O-])(=O)=O)([O-])(=O)=O.[K+].[K+].O.O.O.O.O.O.O.O.O.O.O.O.P(O)([O-])([O-])=O.[Na+].[Na+].O>C(#N)C>[N:19]([C@H:16]1[C:17](=[O:18])[NH:14][C@H:15]1[C:22]([O:24][CH2:25][CH2:26][CH2:27][CH3:28])=[O:23])=[N+:20]=[N-:21]A mixture of 200 mg (0.529 mmole) of butyl cis-1-benzhydryl-3-azido-4-oxo-2-azetidine carboxylate, 473 mg (1.75 mmole) of potassium persulfate, 307 mg (0.858 mmole) of disodium phosphate dodecahydrate, 9.2 ml of water and 8.4 ml of acetonitrile was thoroughly degassed with argon and then heated to 80°-85° C. under argon for three hours. The reaction mixture was cooled and the acetonitrile removed on the rotary evaporator. The aqueous residue was saturated with solid sodium chloride and extracted three times with ethyl acetate. The combined organic extractions were washed with brine, dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo to give 197 mg of crude material. This material was chromatographed on ten grams of 70-230 mesh silica gel and 31 mg (28%) of the desired product, a light yellow foam was eluted with 20% EtOAc in benzene. tlc: silica gel GF; 20% ethylacetate benzene, R.f.=0.15.
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