[CH3:1][C:2]1[C:7]([O:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])=[C:6]([CH2:14][O:15][C:16]([O:18][CH2:19][CH3:20])=[O:17])[C:5]([CH2:21]Cl)=[CH:4][N:3]=1.CCOC(S)=[S:27]>>[CH3:1][C:2]1[C:7]([O:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])=[C:6]([CH2:14][O:15][C:16]([O:18][CH2:19][CH3:20])=[O:17])[C:5]([CH2:21][SH:27])=[CH:4][N:3]=12-Methyl-3-ethoxycarbonyloxy-4-ethoxycarbonyloxymethyl-5-chloromethylpyridine is converted to the corresponding ethyl xanthogenate and reduced in accordance with the procedure of Example 19 Step B to give 2-methyl-3-ethoxycarbonyloxy-4-ethoxycarbonyloxymethyl-5-mercaptomethylpyridine.
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