Phosgene → 2-Methyl-1,3-thiazole-5-carbonyl chloride

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Reaction Steps

In a similar apparatus to Example 1,5.7 g (0.04 mole) of 2-methylthiazole-5-carboxylic acid were suspended in 100 ml of toluene. Under heating and reflux, phosgene was blown at a rate of 390 ml/hr for 10 hours (0.17 mole). After completion of the blowing, stirring was continued for additional 2 hours. After completion of the reaction, the reaction mixture was filtered and the filtrate was concentrated to obtain 5.7 g of 2-methylthiazole-5-carboxylic acid chloride. Its purity and yield were 95.0% and 95.0%, respectively. NMR (δCDCl 3/TMS, ppm): 2.79(3H,s).

Provenance & Evidence