Alkylation of the potassium anion of the glyoxal derivatives (4) with halides and sulphonate esters, followed by acidic hydrolysis, provides good yields of the corresponding pyruvaldehyde α-thioacetals.
G. S. Bates and S. Ramaswamy, J. Chem. Soc., Chem. Commun., 1980, 904 DOI: 10.1039/C39800000904
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