[Na].CO.[S:4]1[CH:8]=[CH:7][S:6][C:5]1=[C:9]([C:15](=[O:30])[N:16]([CH2:23][C:24]1[CH:25]=[N:26][CH:27]=[CH:28][CH:29]=1)[CH2:17][CH2:18][C:19]([O:21][CH3:22])=[O:20])[C:10](OCC)=[O:11]>C1C=CC=CC=1>[N:26]1[CH:27]=[CH:28][CH:29]=[C:24]([CH2:23][N:16]2[C:15](=[O:30])[C:9](=[C:5]3[S:4][CH:8]=[CH:7][S:6]3)[C:10](=[O:11])[CH:18]([C:19]([O:21][CH3:22])=[O:20])[CH2:17]2)[CH:25]=1Sodium (156 mg) is added to methanol (5ml) and thereto is added a solution of ethyl 2-(1,3-dithiol-2-ylidene)-2-[N-(3-pyridylmethyl)-N-(methoxycarbonylethyl)carbamoyl]acetate (2.21 g) in benzene (35 ml). The mixture is refluxed for 3 hours, and distilled to remove the solvent. The residue is dissolved in ethyl acetate, and the solution is washed with water, dried and then distilled to remove the solvent. The residue is recrystallized from a mixture of ethyl acetate and n-hexane to give methyl 1-(3-pyridylmethyl)-5-(1,3-dithiol-2-ylidene)-4,6-dioxopiperidine-3-carboxylate (1.0 g, 51%) as pale yellow needles, m.p. 111°-114° C.
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