Ethyl 2-(3-chloro-2-yl)-5-hydroxy-pyrazole-3-carboxylate is an important intermediate for the synthesis of pesticides chlorantraniliprole. This work described an expedient route and technology for the pyrazole synthesis using 2,3-dichloropyridine as starting material, via hydrazinolysis and cyclization with optimized total yield of 43.1%, and the hydrazinolysis process is simple with solvent-free.

This study presents a simple, solvent-free method for synthesis of Ethyl 2-(3-chloro-2-yl)-5-hydroxy-pyrazole-3-carboxylate, an intermediate for chlorantraniliprole, with optimized yield of 43.1%.

Paper

The Synthesis of Ethyl 2-(3-chloro-2-yl)-5-hydroxy-pyrazole-3-carboxylate

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