Acetone → 2-Azido-4-(3-trifluoromethyl-phenyl)-thiazole-5-carboxylic acid ethyl ester

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Reaction Steps

To a stirred solution of 2.99 g (8.90 mmole) of 2-chloro-4-(3-trifluoromethyl-phenyl)-thiazole-5-carboxylic acid ethyl ester, 27 mL of acetone and 27 mL of water was added 2.97 g (45.15 mmole) of sodium azide. The mixture was heated at 70 degrees for 11 hours. The mixture was partitioned between 200 mL of ethyl acetate and 75 mL of water. The aqueous layer was extracted twice with 60 mL of ethyl acetate. The combined ethyl acetate layers were washed with 50 mL of brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 2.97 g of 2-azido-4-(3-trifluoromethyl-phenyl)-thiazole-5-carboxylic acid ethyl ester as a dark brown oil.

Provenance & Evidence