Molecules (Jan 2023)

Reshuffle Bonds by Ball Milling: A Mechanochemical Protocol for Charge-Accelerated Aza-Claisen Rearrangements

  • Christian Schumacher,
  • Lieselotte Fritz,
  • Lena M. Hanek,
  • Vitali Sidorin,
  • Daniel Brüx,
  • Carsten Bolm

DOI
https://doi.org/10.3390/molecules28020807
Journal volume & issue
Vol. 28, no. 2
p. 807

Abstract

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This study presents the development of a mechanochemical protocol for a charge-accelerated aza-Claisen rearrangement. The protocol waives the use of commonly applied transition metals, ligands, or pyrophoric Lewis acids, e.g., AlMe3. Based on (heterocyclic) tertiary allylamines and acyl chlorides, the desired tertiary amides were prepared in yields ranging from 17% to 84%. Moreover, the same protocol was applied for a Belluš–Claisen-type rearrangement resulting in the synthesis of a 9-membered lactam without further optimization.

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