Strain‐Release Driven Spirocyclization of Azabicyclo[1.1.0]butyl Ketones

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Due to their intrinsic rigidity, three‐dimensionality and structural novelty, spirocyclic molecules have become increasingly sought‐after moieties in drug discovery. Herein, we report a strain‐release driven synthesis of azetidine‐containing spirocycles by harnessing the inherent ring strain of the azabicyclo[1.1.0]butane (ABB) fragment. Novel ABB‐ketone precursors bearing silyl‐protected alcohols were synthesised in a single step and shown to engage in electrophile‐induced spirocyclization‐desilylation reactions. Primary, secondary and tertiary silyl ethers were effectively transformed into a library of new spiro‐azetidines, with a range of substituents and ring sizes. In addition, the products are generated with synthetically useful ketone and protected‐amine functional groups, which provides the potential for further elaboration and for this chemistry to be utilized in the rapid assembly of medicinally relevant compounds.
Original languageEnglish
JournalAngewandte Chemie - International Edition
Early online date22 Mar 2021
Publication statusE-pub ahead of print - 22 Mar 2021


  • Azabicylo[1.1.0]butanes
  • Azetidines
  • heterocycles
  • Spiro compounds
  • Strained molecules

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