(CAAC)Copper Catalysis Enables Regioselective Three-Component Carboboration of Terminal Alkynes



Cyclic(alkyl)(amino)carbene (CAAC) ligands are found to perturb regioselectivity of the copper-catalyzed carboboration of terminal alkynes, favoring the less commonly observed internal alkenylboron regiosomer through an α-selective borylcupration step. A variety of carbon electrophiles participate in the reaction, including allyl alcohols derivatives and alkyl halides. The method provides a straightforward and selective route to versatile tri-substituted alkenylboron compounds that are otherwise challenging to access.


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Supplementary material

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Supporting Information
experimental procedures, characterization data for new compounds, copies of NMR spectra
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NMR Data
NMR data in MNova format