On December 7, 2011, Lu, Shoufu; Yu, Xinmin published a patent.HPLC of Formula: 1198284-94-4 The title of the patent was Method for preparing diazaspirocyclic compounds. And the patent contained the following:
The invention relates to a process for the preparation of diazaspirocyclic compounds (e.g., I). For instance, substitution of compound II with 1-bromo-3-chloro-propane followed by azidation, heterocyclization, and reduction gave compound I as a white solid. The experimental process involved the reaction of tert-Butyl 1-oxo-2,9-diazaspiro[5.5]undecane-9-carboxylate(cas: 1198284-94-4).HPLC of Formula: 1198284-94-4
The Article related to diazaspirocyclic compound preparation, Heterocyclic Compounds (One Hetero Atom): Spiro Compounds With One Hetero Atom In Each Ring and other aspects.HPLC of Formula: 1198284-94-4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics