HCID 86586329, compound → HCID 23560819, compound

Participants

Reaction Steps

Manganese dioxide (1.0 g, 11.5 mmol) was added to a stirred solution of crude (5-hydroxymethyl-4-trifluoromethylthiazol-2-yl)carbamic acid, 1,1-dimethylethyl ester (Example 29; 480 mg, 1.6 mmol) in acetonitrile (20 mL). The mixture was allowed to stir at room temperature for 1 h and then a further portion of manganese dioxide (0.50 g, 5.75 mmol) was added. The reaction mixture was stirred at room temperature for 1 h, it then it was filtered through Celite® and the filter pad was washed with acetonitrile. The filtrate was evaporated to dryness to give (5-formyl-4-trifluoromethylthiazol-2-yl)carbamic acid, 1,1-dimethylethyl ester (480 mg). Examination of the crude product by NMR indicated the presence of approximately 33% of (5-ethoxycarbonyl-4-trifluoromethylthiazol-2-yl)carbamic acid, 1,1-dimethylethyl ester. This mixture was used without further purification in a subsequent transformation.

Provenance & Evidence