Lan Zhi-li
2007
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Journal
Fine Chemical Intermediates
Abstract
Ethyl 3-bromo-1-(3-chloro-2-pyridinyl)-4,5-dihydro-1H-pyrazole-5-carboxylate is an important intermediate of a new insecticide chlorantraniliprole. It was synthesized from ethyl 2-(3-chloro-2-pyridinyl)-5-oxo-3-pyrazolidinecarboxylate through esterification and bromination. The total yield and purity of the product was 91.0% and 99% respectively,indicating that this was a promising industrialization route because of its simply synthetic process and low cost