Synthesis Of Pestcide OMI-88

Four different approches to the title ccopound were tested. The best oneis as fOllow: 1rmethyl-4-chloro -3-ethyl -5-pyrazolecarboxylic acid 8 isprepared by a five-step synthesis using butanone and diethyl oxalate asstarting materjaJs, wi th a yield of 56. 5%. 8 is then condensed wi th (4-methylphenoxy) benzylafuine l3, prepared from p-chloroanil ine via a three-stepsynthesis, to give the title compound with a yield of 79. 3%...