92567-02-7Relevant articles and documents
Azosemide intermediate synthesizing method
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Paragraph 0025; 0026; 0027; 0027; 0028, (2017/07/20)
The invention discloses an azosemide intermediate synthesizing method. The method comprises the steps of performing tetrazole reaction to prepare a compound A: warming and enabling 4-chlorin-2-nitro benzonitrile and sodium azide to react under action of a catalyst and extracting reaction liquid by water to obtain reaction liquid of the compound A; directly performing hydrogenation reaction to prepare a compound B; performing chlorosulfonation reaction to prepare a compound C: slowly dropping qualified compound B and chlorosulfonic acid into cold water after temperature reaction and center control qualification, extracting through an organic solvent, standing for layering and decompressing, evaporating and drying the solvent in an organic phase mode to obtain a compound crude product C; performing ammonolysis reaction to prepare a compound D. Compared with the prior art, raw materials of the method disclosed by the invention are easy to obtain and low in cost; the method is low in cost, convenient to operate, suitable for industrialization and little in generated three wastes; furthermore, comprehensive utilization of waste can meet national industrial policy.