An efficient green pymetrozine preparation

The present invention discloses an efficient green pymetrozine preparation. The methyl acetate byproduct Methods pymetrozine generated condensation step as a raw material, instead of the traditional process for the synthesis of ethyl acetate acetohydrazide, and the resulting byproduct methanol solvent may be used as the subsequent step, so that byproducts are recovered utilization, and improve the utilization of raw materials. In the condensation step using a saturated methanol solution of hydrogen chloride in concentrated hydrochloric acid or hydrogen chloride alternative conventional process used to avoid moisture in the system such that the aminotriazinone hydrolysis reaction, substantially eliminate the production of by-products. This method not only improves the efficiency and product yield hydrogen chloride and shorten the reaction time, but also reduces the waste water, waste gas emissions and reduce overall production costs and create better conditions for industrial scale production of the product.