A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Safety of tert-Butyl 2-amino-7-azaspiro[3.5]nonane-7-carboxylate, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1239319-82-4, Name is tert-Butyl 2-amino-7-azaspiro[3.5]nonane-7-carboxylate, molecular formula is C13H24N2O2. In a Patent, authors is ，once mentioned of 1239319-82-4
The present invention relates to a compound of Formula (I)-(IV) useful as beta-lactamase inhibitor, a pharmaceutically acceptable salt, ester, solvate or stereoisomer thereof, wherein R1, R2, M and ring A have definitions as those in the specification. The present invention further relates to methods for preparing these compounds, pharmaceutical compositions comprising these compounds, and uses of these compounds. For example, the compounds of the present invention can be used as beta-lactamase inhibitors, for treatment and/or prophylaxis of diseases caused by bacterial infections, solving drug-resistance problems caused by beta-lactamases, especially bacterial drug-resistant diseases caused by type B metallo-beta-lactamases.
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H19951N – PubChem