You could try the old Riley oxidation with SeO2 . refluxing the compound with SeO2 in dry dioxane is perhaps a way. If not you can also to first make aradical substitution with NBS and then oxidises with IBX or by Khrönke's method.
SOdiumhypochlorite and tert-butylhydroperoxide can do this transformation.
Dear Daniel,
Since methyl group is next to double bond I hope it is allylic and you want to convert it into aldehyde group. The better way you can go for a two step synthesis. Reacting with NBS in presence of peroxide to give methyl bromide and then oxidizing it in to aldehyde group using an oxidizing agent. Hydrogen peroxide is one of the oxidizing agents used for such transformations. You can search for more oxidizing agents in literature.
Direct oxidation of methyl group using a strong oxidizing agent may lead to reaction at double bond forming various biproducts.
Best regards,
Rajesh
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