Ethyl 2-chloroacetoacetate → Ethyl 2-anilino-4-methyl-1,3-thiazole-5-carboxylate

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A mixture of phenylthiourea (5.04 g, 33.1 mmol) and 2-chloro-3-oxo-butyric acid ethyl ester (4.8 mL, 34.8 mmol) in ethanol (50 mL) was refluxed for 19 h before it was cooled to room temperature and concentrated in vacuo. It was partitioned between ethyl acetate and saturated sodium bicarbonate, the organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo to give the title compound as a yellow solid (8.18 g): MS: (+) m/z 263.0 (M+1).

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