[2,3]-Sigmatropic rearrangement with [1.1.1]propellane.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40623981.
- Also identified by DOI 10.1038/s41467-025-60805-2 and PMC identifier 12234950.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The most established reactivity of [1.1.1]propellane involves addition reactions at the bridge C-C bond, resulting in the formation of bicyclo[1.1.1]pentane derivatives. Herein, we present a [2,3]-sigmatropic rearrangement that uses [1.1.1]propellane as a carbene precursor to rapidly access allenylated or allylated methylenecyclobutanes. The reaction is highly efficient and scalable, works well under mild conditions, and can tolerate a diverse range of functional groups on propargyl and allyl sulfides/selenides. Another significant achievement of this approach is the utility of the obtained products in synthesizing substituted bicyclo[2.1.1]hexanes, potential bioisosteres of ortho and meta-substituted benzenes, by developing a photocatalyzed radical cascade cyclization. Density functional theory calculations suggest the involvement of a copper-bound five-membered transition state.