[CH3:1][O:2][C:3](=[O:21])[C:4]1[CH:9]=[C:8]([NH:10][C:11](=[S:18])[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:7]=[CH:6][C:5]=1[O:19][CH3:20].[OH-].[Na+]>O.CO.[Fe-3](C#N)(C#N)(C#N)(C#N)(C#N)C#N.[K+].[K+].[K+]>[CH3:1][O:2][C:3]([C:4]1[C:5]([O:19][CH3:20])=[CH:6][C:7]2[S:18][C:11]([C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=3)=[N:10][C:8]=2[CH:9]=1)=[O:21]A 2 liter round bottom flask was charged with 81 grams (246 mmol) potassium ferricyanide in 300 mL of water, the solution was warmed to 55° C. A solution of 14.78 grams (49 mmol) methyl-2-methoxy-5-benzthioamido-benzoate in 200 mL of methanol and 100 mL aqueous sodium hydroxide solution [13.7 gm (343 mmol) NaOH/100 mL] was then added. A yellow precipitate was soon deposited. The mixture was stirred at 60° C. for 1.5 hours. The reaction mixture was partitioned between 1 liter ethyl acetate and 300 mL 3.4N HCl (aqueous). The organic phase was washed with water and brine solution and then dried over sodium sulfate. After filtration, the filtrate was evaporated and the residue, as a mixture of carboxylates, was used directly in the next step. (affords 12.9 grams crude)
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