Synlett 2024; 35(09): 1001-1006
DOI: 10.1055/a-2201-7326
cluster
Chemical Synthesis and Catalysis in Germany

Alkene versus Aryl Chlorination in Asymmetric Hypervalent Iodine Catalysis: A Case Study

Andreas M. Arnold
a   Institute of Organic Chemistry, Leipzig University, Johannisallee 29, 04103 Leipzig, Germany
b   Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
,
Julia Binder
a   Institute of Organic Chemistry, Leipzig University, Johannisallee 29, 04103 Leipzig, Germany
b   Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
,
Martin Kretzschmar
a   Institute of Organic Chemistry, Leipzig University, Johannisallee 29, 04103 Leipzig, Germany
,
Tanja Gulder
a   Institute of Organic Chemistry, Leipzig University, Johannisallee 29, 04103 Leipzig, Germany
b   Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748 Garching, Germany
› Author Affiliations
This work was funded by the Deutsche Forschungsgemeinschaft (DFG, GU 1134/5). A.M.A. thanks the Fonds der Chemischen Industrie for a PhD Fellowship.


Abstract

Hypervalent λ3-iodanes have become a prominent tool for halofunctionalizations of alkenes. Despite many examples of asymmetric fluorinations reported lately, the corresponding enantioselective chlorination reactions using iodoresorcinol-based catalysts are significantly less developed, with only one example known to date. Here, we show how competing aromatic chlorination of the iodoarene catalyst is a significant obstacle in these transformations, hinting towards a conceptual issue with this well-established catalyst class for enantioselective chlorinations. Consequently, the reaction conditions and the catalyst design must be adapted to facilitate an effective chirality transfer. Hence, attention should be paid when selecting the oxidizing agent, the stoichiometry, and careful reaction analysis must be conducted to identify the factual catalytically active species.

Supporting Information



Publication History

Received: 05 October 2023

Accepted after revision: 30 October 2023

Accepted Manuscript online:
30 October 2023

Article published online:
06 December 2023

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