[C:1]([C:3]1[CH:8]=[CH:7][C:6]([C:9]2[N:10]=[C:11]([CH:14]([CH2:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[C:15]([O:17]C)=[O:16])[NH:12][CH:13]=2)=[CH:5][CH:4]=1)#[N:2].C(=O)([O-])[O-:27].[K+].[K+].OO.[O-2].[Mg+2]>CS(C)=O>[C:1]([C:3]1[CH:4]=[CH:5][C:6]([C:9]2[N:10]=[C:11]([CH:14]([CH2:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[C:15]([OH:17])=[O:16])[NH:12][CH:13]=2)=[CH:7][CH:8]=1)(=[O:27])[NH2:2]The product from Example 56 Part A (0.99 g, 3.0 mmol) was dissolved in 10 mL of DMSO. Potassium carbonate (1.24 g, 9.0 mmol) was added. The mixture was cooled to 0-5° C. and 30% H2O2 (3.18 mL of 30% aqueous solution) was added, followed by magnesium oxide (0.24 g, 15 mmol). The cooling bath was removed and the mixture was stirred at RT under N2 for 4 h. The mixture was filtered to remove inorganic material. Water (30 mL) was added to the filtrate and the resulting mixture was stirred at rt for 40 min. The mixture was acidified with 1N HCl to pH 5. The precipitate formed was filtered and dried to afford 0.67 g of the acid (67%). MS 336.30 (M+H)+.
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