[S:1]1[C:5]([C:6]([O:8]C)=O)=[CH:4][N:3]=[CH:2]1.[C:10](#[N:12])[CH3:11].[H-].[Na+:14].C(OC)(C)(C)C>C1COCC1>[C:10]([CH:11]=[C:6]([C:5]1[S:1][CH:2]=[N:3][CH:4]=1)[O-:8])#[N:12].[Na+:14]A solution of 1.5 g (10.5 mmol) of methyl 1,3-thiazole-5-carboxylate and 430 mg (10.8 mmol) of acetonitrile in 15 ml of THF was added dropwise to a suspension of 419 mg of sodium hydride (60% strength suspension in mineral oil) in 16 ml of THF which was heated under reflux. The reaction mixture was heated under reflux for 20 h. After cooling, 50 ml of methyl tert-butyl ether were added and the mixture was stirred for 30 minutes. The resulting precipitate was filtered off with suction through a frit and dried under oil pump vacuum. This gave 1.71 g (94% of theory) of the title compound which was combined with the product (3.48 g, 95% of theory) from a second batch starting with 3.0 g (21 mmol) of methyl 1,3-thiazole-5-carboxylate. This material was used without further characterization for the next step.
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