I found the field of Chemistry very interesting. Saw the article A General Catalytic Route to Enantioenriched Isoindolinones and Phthalides: Application in the Synthesis of (S)-PD 172938 published in 2019. COA of Formula: C7H13NO2, Reprint Addresses Singh, VK (corresponding author), Indian Inst Technol Kanpur, Dept Chem, Kanpur 208016, Uttar Pradesh, India.. The CAS is 177-11-7. Through research, I have a further understanding and discovery of 1,4-Dioxa-8-azaspiro[4.5]decane
Chiral Bronsted acid catalyzed enantioselective syntheses of isoindolinones and phthalides have been accomplished via tandem Mannich-lactamization and aldol-lactonization reactions, respectively. A variety of enantioenriched isoindolinones (up to 99% ee) and phthalides (up to 85% ee) containing alpha-diazoesters were afforded in excellent yields. Furthermore, a concise synthesis of (S)-PD 172938 has been demonstrated by using this protocol.
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H7510N – PubChem