Yang Yun-shang
2011
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Journal
Journal of Lanzhou University of Technology
Abstract
Taking 2,3-dichloropyridine as raw material,the key intermediate 3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxylic acid was obtained by means of hydrazining,diethyl maleate,ester-bromination,oxidation,and hydrolysis first.Then the carbonyl chloride was synthesized with dichloro sulfoxide.Finally,the 3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxylic acid ammide compounds were synthesized with carbonyl chloride reacting with ring ammonia.The final compounds were characterized.