[OH:1][CH2:2][C:3]1[N:4]=[C:5]([C:8]([O:10][CH2:11][CH3:12])=[O:9])[S:6][CH:7]=1>[O-2].[O-2].[Mn+4].C1COCC1>[CH:2]([C:3]1[N:4]=[C:5]([C:8]([O:10][CH2:11][CH3:12])=[O:9])[S:6][CH:7]=1)=[O:1]A mixture of ethyl 4-(hydroxymethyl)-1,3-thiazole-2-carboxylate (1.23 g), manganese dioxide (5.71 g) and THF (25 ml) was heated at 50° C. overnight. The inorganic material was removed by filtration, and the filtrate was concentrated in vacuo to give the title compound (1.11 g) as a yellow solid.
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