The invention provides a preparation method of
sodium avibactam. The method comprises that
sodium 2-ethylhexanoate reacts with an intermediate
compound K, so that the
sodium avibactam is obtained. Theinvention also provides a preparation method of the intermediate
compound K. The preparation method comprises the following steps: (1) carrying out reaction on a compound J with
ammonium formate,
formic acid and
triethylamine in presence of a catalyst, and removing benzyl, so that a
compound K1 is obtained; (2) adding an acid binding agent, a sulfonation
reagent and water into the K1 reaction liquid obtained in the step (1), and reacting; and (3) adding tetrabutylammonium acetate
aqueous solution into the reaction liquid obtained in the step (2), stirring and reacting, then adding an extraction
solvent, separating out an organic phase,
drying, then distilling off the
solvent, adding a
crystallization solvent, stirring, and crystallizing, so that the compound K is obtained. The preparationmethods provided by the invention are low in cost, avoid a high-risk preparation method for debenzylation through hydrogenation, are high in safety performance, easy to operate and applicable to industrial production and have greater application value.