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A solution of 10.94 grams (40.4 mmol) 6-methoxy-2-phenyl-5-hydroxymethylbenzothiazole (as part of a mixture of regioisomeric alcohols) in 600 mL of methylisobutyl ketone was treated with 42 grams (484 mmol) of manganese dioxide. The mixture was heated under reflux for 1.5 hours and was then filtered through Celite®. The filtrate was evaporated in vacuo and the residue was chromatographed on silica (elution with 9/1 hexane/ethyl acetate). Mixed fractions were rechromatographed on silica using 95/5 hexane/ethyl acetate to afford a total of 2.43 grams of the desired aldehyde.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 1.5 hours
3. filtrationwas then filtered through Celite®
4. customThe filtrate was evaporated in vacuo
5. customthe residue was chromatographed on silica (elution with 9/1 hexane/ethyl acetate)
6. customMixed fractions were rechromatographed on silica using 95/5 hexane/ethyl acetate