Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (5): 20240547.doi: 10.7503/cjcu20240547

• Organic Chemistry • Previous Articles     Next Articles

Ring-opening Mechanism of 2-Phenyl-3-amineazetidine to Form Thiazole or Oxazole

XU Xingyu(), XIE Xiaoming, QIU Ping   

  1. Department of Chemistry,Xinzhou Normal University,Xinzhou 034000,China
  • Received:2024-12-18 Online:2025-05-10 Published:2025-03-03
  • Contact: XU Xingyu E-mail:xuxingyuxz@163.com
  • Supported by:
    the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province, China(2021L456)

Abstract:

Based on the density functional theory(DFT), the Minnesota functional M06-2X method was employed to study the ring-opening reaction mechanism of (2S,3S)-2-phenyl-1-[(S)-1-phenylethyl]azetidin-3-amine reacting with phenylisothiocyanate or phenylisocyanate. The amine reacting with phenylisothiocyanate generates an interme- diate, which then undergoes proton transfer. Subsequently, the sulfur atom conducts a nucleophilic attack on the C2 position of the four-membered ring to give dihydrothiazole after isomerization from a five-membered ring. The amine reacting with phenylisocyanate forms urea. Protic acid or copper trifluoromethanesulfonate is required when the four-membered ring of the urea undergoes a ring-opening reaction.

Key words: 3-Aminoazetidine, Ring opening reaction, Density functional theory, Reaction mechanism

CLC Number: 

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