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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Elucidating the Multicomponent Reaction Pathway of 2‑Pyrrolidone Synthesis.

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This study clarifies the synthesis of 2-pyrrolidone derivatives using multicomponent reactions (MCRs). We used mass spectrometry and X-ray diffraction to confirm product structures and elucidate the reaction mechanism, identifying key intermediates and catalysts.

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Area of Science:

  • Organic Chemistry
  • Chemical Synthesis
  • Reaction Mechanism Elucidation

Background:

  • 2-Pyrrolidone derivatives are biologically significant heterocycles.
  • Multicomponent reactions (MCRs) offer efficient synthesis but can be mechanistically complex.
  • Distinguishing 2-pyrrolidones from isomeric furanones is challenging.

Purpose of the Study:

  • To unambiguously determine the structure of products from the reaction of anilines, benzaldehydes, and diethyl acetylenedicarboxylate.
  • To elucidate the reaction mechanism of this MCR.
  • To establish an analytical framework for similar reactions.

Main Methods:

  • Electron Impact Mass Spectrometry (EI-MS) for fragmentation analysis.
  • Direct Analysis in Real Time Mass Spectrometry (DART-MS) for intermediate detection.
  • Single-crystal X-ray diffraction for definitive structural confirmation.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Exclusive formation of 2-pyrrolidone products was confirmed.
  • EI-MS fragmentation patterns ruled out furanone isomers.
  • Time-resolved DART-MS identified key intermediates (imines, hydrated alkyne adducts, pyrrolidone species).
  • A stepwise mechanism involving imine formation, alkyne hydration, nucleophilic addition, and lactamization was proposed.
  • Citric acid was identified as an optimal catalyst.

Conclusions:

  • The study provides the first experimentally supported mechanism for this 2-pyrrolidone MCR.
  • A robust analytical strategy for structural and mechanistic studies of pyrrolidone synthesis was established.
  • Understanding the mechanism allows for optimization of reaction conditions and catalyst selection.