Synthesis 2021; 53(12): 2043-2050
DOI: 10.1055/a-1372-6309
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Catalytic Activation of a Carbon–Chloride Bond by Dicationic Tellurium-Based Chalcogen Bond Donors

Tim Steinke
,
Patrick Wonner
,
Elric Engelage
,
The authors thank the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (638337) for financial support. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC 2033 – 390677874 – RESOLV.


Abstract

Noncovalent interactions such as halogen bonding (XB) and chalcogen bonding (ChB) have gained increased interest over the last decade. Whereas XB-based organocatalysis has been studied in some detail by now, intermolecular ChB catalysis only emerged quite recently. Herein, bidentate cationic tellurium-based chalcogen bond donors are employed in the catalytic chloride abstraction of 1-chloroisochroman. While selenium-based ChB catalysts showed only minor activity in this given benchmark reaction, tellurium-based variants exhibited strong activity, with rate accelerations of up to 40 relative to non-chalogenated reference compounds. In general, the activity of the catalysts improved with weaker coordinating counterions, but tetrafluoroborate took part in a fluoride transfer side reaction. Catalyst stability was confirmed via a fluoro-tagged variant.

Supporting Information



Publication History

Received: 01 December 2020

Accepted after revision: 25 January 2021

Accepted Manuscript online:
25 January 2021

Article published online:
18 February 2021

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