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The present invention relates to is suitable for industrial production of high-purity anchors ma duan preparation method, 3 – nitro phthalic anhydride with the glutamic acid reaction intermediates, in acetic anhydride under the conditions of the intermediate obtained in the reaction, under the conditions of the reaction in DMSO to obtain 3 – nitro – N – (2, 6 – dioxo – 3 – piperidinyl) phthalimide, palladium hydrocarbon obtained through anchors ma duan, this process has high yield, the operation is simple, environment friendly, and is suitable for mass production and the like, adopts low-toxicity solvent has been solved because the solvent residue caused by the problem of the unqualified products. (by machine translation)
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H23199N – PubChem