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What changes in the rerouted reaction?
Conventional Suzuki–Miyaura coupling joins an aryl electrophile and an organoboron partner to form a biaryl, with the two aromatic groups connected directly by a C–C bond. In the aminative version, a formal NH insertion diverts the pathway so the product has an aryl–nitrogen–aryl, or C–N–C, linkage: a diaryl amine.
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Onnuch, Ramagonolla and Liu describe the approach as bringing together starting-material classes associated with Suzuki–Miyaura and Buchwald–Hartwig couplings. The shared aryl partners make the rerouting idea useful to consider, but the altered product depends on adding a nitrogen source and using a catalyst system designed to favor insertion over ordinary C–C coupling.
How the two pathways compare
| Feature | Conventional Suzuki–Miyaura | Aminative Suzuki–Miyaura |
|---|---|---|
| Product linkage | Biaryl with a C–C bond between aryl groups | Diaryl amine with a C–N–C linkage |
| Starting-material classes | Aryl electrophile and boronic acid or ester | Aryl electrophile and boronic acid or ester, plus an electrophilic nitrogen reagent |
| Catalyst approach | Palladium-catalyzed coupling | Palladium with a bulky phosphine ligand, including t-BuBrettPhos in the reported optimized example; conditions vary by substrate |
| What the 2024 study establishes | Background reaction used as the pathway being diverted | Substrate scope, selected late-stage transformations and early reaction extensions; not manufacturing-scale performance |
Which substrates did the study examine?
The authors report aryl chlorides, bromides, triflates and tosylates as electrophile classes, paired with boronic acids or esters. They describe compatibility with a range of functional groups and medicinal-chemistry-relevant heterocycles, while noting that conditions may need adjustment for different substrate classes.
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That breadth does not mean uniform performance. In one optimized model reaction using t-BuBrettPhos-modified palladium, the aminative product was obtained in 96% yield after 12 hours, with only trace Suzuki product reported. This is a result for that example and condition set, not a general expected yield. A substrate bearing a primary alcohol gave 36% yield, with possible competing side reactions discussed by the authors.
What do the late-stage examples show?
The paper applies the chemistry to late-stage diversification, including a modified Etoricoxib intermediate obtained in 50% yield on a 1-mmol scale. These examples show that the reaction can alter complex molecules or intermediates in a synthetic setting. They do not show that the resulting compounds have improved biological activity, therapeutic value or clinical performance.
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The authors also report a tandem sequence combining NH and carbonyl insertion to make an amide in 55% yield, plus an aminative Tsuji–Trost allylation demonstration under unoptimized conditions. These are preliminary extensions, not evidence that all cross-coupling reactions can be redirected in the same way.
Why controlling the pathway is difficult
The central challenge is to slow the highly effective Suzuki pathway enough for nitrogen insertion to compete, without preventing formation of the second C–N bond needed for the diaryl amine. The study discusses potential problems such as premature reaction of the amination reagent, homocoupling and other competing pathways. Catalyst and condition choices therefore matter, and substrate-specific results should not be inferred from one another.
The precise order of bond-forming events is also not established as a single sequence for every substrate. The authors discuss both electrophile-first and nucleophile-first routes, with evidence that can vary by substrate. Chemistry World reported that identifying which route a given substrate favors remains a question for future work.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where this fits in cross-coupling research
Researchers have expanded cross-coupling chemistry through strategies including fluorination, trifluoromethylation, coupling from alkyl electrophiles, reductive cross-electrophile coupling and C–H activation. The aminative Suzuki–Miyaura work adds another design idea: retain recognizable coupling partners but insert an atom into the product-forming pathway to reach a different scaffold.
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Insertion into cross-coupling pathways is not wholly new; carbonylative Stille coupling is an established example of inserting a component. The 2024 paper demonstrates NH insertion and an NH-plus-carbonyl sequence, while broader applications to other reaction classes remain prospective. The reported results are laboratory chemistry, and the sources do not establish large-scale manufacturing performance.
Quick Recap
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Sources
- Polpum Onnuch, Kranthikumar Ramagonolla and Richard Y. Liu, “Aminative Suzuki–Miyaura coupling,” Science 383, 1019–1024, published 1 March 2024. Primary research article.
- Ellis Wilde, “Classic cross-coupling reactions rerouted to make new products,” Chemistry World, 7 March 2024. News report and expert comments.
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