A useful protocol for achieving decarboxylative cross-coupling
(DCC) of redox-active esters (RAE, isolated or generated in situ)
and halo(hetero)arenes is reported. This pragmatically focused study
employs a unique Ag–Ni electrocatalytic platform to overcome
numerous limitations that have plagued this strategically powerful
transformation. In its optimized form, coupling partners can be combined
in a surprisingly simple way: open to the air, using technical-grade
solvents, an inexpensive ligand and Ni source, and substoichiometric
AgNO3, proceeding at room temperature with a simple commercial
potentiostat. Most importantly, all of the results are placed into
context by benchmarking with state-of-the-art methods. Applications
are presented that simplify synthesis and rapidly enable access to
challenging chemical space. Finally, adaptation to multiple scale
regimes, ranging from parallel milligram-based synthesis to decagram
recirculating flow is presented.
Carboxylic acids, the most versatile and ubiquitous diversity
input
used in medicinal chemistry for canonical polar bond constructions
such as amide synthesis, can now be employed in a fundamentally different
category of reaction to make C–C bonds by harnessing the power
of radicals. This outlook serves as a user-guide to aid practitioners
in both the design of syntheses that leverage the simplifying power
of this disconnection and the precise tactics that can be employed
to enable them. Taken together, this emerging area holds the potential
to rapidly accelerate access to chemical space of value to modern
medicinal chemistry.
Simple access to aryl sulfinates from aryl iodides and bromides is reported using an inexpensive Ni‐electrocatalytic protocol. The reaction exhibits a broad scope, uses stock solution of simple SO2 as sulfur source, and can be scaled up in batch and recycle flow settings. The limitations of this reaction are clearly shown and put into context by benchmarking with state‐of‐the‐art Pd‐based methods.
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