We have developed a general approach to the catalytic hydrofunctionalization of alkynes,
involving hydrocupration and electrophilic functionalization of the resulting alkenylcopper
intermediate. Using this approach with different electrophiles we have developed three
transformations: semireduction, hydrobromination, and hydroalkylation of alkynes.
In the context of a brief history of copper hydride complexes in organic chemistry,
in this account we describe the key developments that inspired and enabled our research.
We also describe the reaction development, the scope, and the mechanism of these transformations.
In the process, we highlight some of the challenges inherent to our approach and summarize
new insights that allowed us to successfully address them.
Key words
catalysis - copper - metal hydrides -
N-heterocyclic carbenes - electrophiles