Ethyl chloroformate → HCID 22288378, compound

Participants

Reaction Steps

An n-butyl lithium-n-hexane solution (1.6 M) was added to a mixture of 2-(1-methyl-3-trifluoromethyl-1H-pyrazol-5-yl)thiazole and THF at −50° C. or below, followed by stirring at −50° C. or below for 90 minutes. Ethyl chloroformate was added to the reaction solution at −20° C. or below. After stirring at −20° C. or below for 15 minutes, it was subjected to purification in the usual way to give ethyl 2-(1-methyl-3-trifluoromethyl-1H-pyrazol-5-yl)thiazole-5-carboxylate. This was hydrolyzed with a base in the usual way to give 2-(1-methyl-3-trifluoromethyl-1H-pyrazol-5-yl)thiazole-5-carboxylic acid.

Provenance & Evidence