A cross-dehydrogenative C(sp<sup>3</sup>)-H heteroarylation via photo-induced catalytic chlorine radical generation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34188034.
- Also identified by DOI 10.1038/s41467-021-24280-9 and PMC identifier 8241867.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Hydrogen atom abstraction (HAT) from C(sp<sup>3</sup>)-H bonds of naturally abundant alkanes for alkyl radical generation represents a promising yet underexplored strategy in the alkylation reaction designs since involving stoichiometric oxidants, excessive alkane loading, and limited scope are common drawbacks. Here we report a photo-induced and chemical oxidant-free cross-dehydrogenative coupling (CDC) between alkanes and heteroarenes using catalytic chloride and cobalt catalyst. Couplings of strong C(sp<sup>3</sup>)-H bond-containing substrates and complex heteroarenes, have been achieved with satisfactory yields. This dual catalytic platform features the in situ engendered chlorine radical for alkyl radical generation and exploits the cobaloxime catalyst to enable the hydrogen evolution for catalytic turnover. The practical value of this protocol was demonstrated by the gram-scale synthesis of alkylated heteroarene with merely 3 equiv. alkane loading.